Develop Bugs

[Q] I can't access Bootloader or Recovery PLEASE Help!

My HTC One M8 (Verizon) is seemingly bricked. My phone is rooted, S-Off, with the stock ROM. I have been trying to update to the latest OTA update by returning to stock. I had previously modified some entries in the Build.prop and Platform.xml. I knew those had to be default in order for the OTA to work. I had copied the original files and pasted them to my SD Card so that I could simply cut the modified versions, paste them to my SD Card, and cut the originals from my SD Card and put them in their corresponding system folders.
Upon a reboot something apparently went horribly wrong because all my phone does now is boot with the white screen and green HTC Logo, then the screen goes black. I have tried the typical Power Button + Volume Down but it won't enter the boot loader. The good news is that the USB port seems to still work for my windows computer recognizes a device connecting to it but it doesn't show up as an interactive device in windows explorer..if that makes sense.
Please Help!

SF-Echo18 said:
My HTC One M8 (Verizon) is seemingly bricked. My phone is rooted, S-Off, with the stock ROM. I have been trying to update to the latest OTA update by returning to stock. I had previously modified some entries in the Build.prop and Platform.xml. I knew those had to be default in order for the OTA to work. I had copied the original files and pasted them to my SD Card so that I could simply cut the modified versions, paste them to my SD Card, and cut the originals from my SD Card and put them in their corresponding system folders.
Upon a reboot something apparently went horribly wrong because all my phone does now is boot with the white screen and green HTC Logo, then the screen goes black. I have tried the typical Power Button + Volume Down but it won't enter the boot loader. The good news is that the USB port seems to still work for my windows computer recognizes a device connecting to it but it doesn't show up as an interactive device in windows explorer..if that makes sense.
Please Help!
Click to expand...
Click to collapse
When you connect it to the PC can you pick up the device with adb? If so, have you tried to run the command from adb to boot it into bootloader? adb devices ... if found, adb reboot bootloader
:fingers-crossed:

BerndM14 said:
When you connect it to the PC can you pick up the device with adb? If so, have you tried to run the command from adb to boot it into bootloader? adb devices ... if found, adb reboot bootloader
:fingers-crossed:
Click to expand...
Click to collapse
I'm not too familiar with ADB commands but I typed in "adb reboot recovery" and it said: "error: device not found" so even if my command was wrong it's still not detecting it. I also tried: "fastboot reboot bootloader" and it just says "waiting for device"
Also I feel like it's worth mentioning the phone is automatically rebooting every two minutes or so (haven't timed it exactly but it's a while). Still showing the green HTC Logo then the screen goes dim, then the screen turns off.

SF-Echo18 said:
I'm not too familiar with ADB commands but I typed in "adb reboot recovery" and it said: "error: device not found" so even if my command was wrong it's still not detecting it. I also tried: "fastboot reboot bootloader" and it just says "waiting on device for device"
Also I feel like it's worth mentioning the phone is automatically rebooting every two minutes or so (haven't timed it exactly but it's a while). Still showing the green HTC Logo then the screen goes dim, then the screen turns off.
Click to expand...
Click to collapse
Try holding volume UP + Power button, this simulates a "battery pull", just hold it in for a while it can take a while to "pull", when it's off try again booting into bootloader, volume DOWN + Power button.

BerndM14 said:
Try holding volume UP + Power button, this simulates a "battery pull", just hold it in for a while it can take a while to "pull", when it's off try again booting into bootloader, volume DOWN + Power button.
Click to expand...
Click to collapse
I held Volume Up + Power Button and it showed the white screen with the green HTC logo. I then released all buttons. Once the screen turned off I then held Volume Down + Power Button for two minutes straight and nothing happened.
Even though we haven't found a solution yet, I am appreciative of the help.

sounds like you never installed the htc drivers for your phone, hence your pc doesn't see the phone when you are doing ADB commands.
install the drivers for it, then try the ADB commands via your pc
and dont mess with the build prop or other system files unless you have a working back up and are 101% certain about what you are doing..

Just remember to change directory in command prompt to the folder where adb.exe is located.
I don't know why the device doesn't reboot into bootloader though when you hold volume down + power button, shouldn't have to hold it for 2minutes. Holding volume up + power button to simulate a "pull" should only take up to 20 seconds or so at most and pressing volume down + power will then immediately take you into bootloader mode, or at least it's supposed to.
Did you release the volume up / power combo when the screen went dead or before? Try holding it until the phone shuts off and then right away press volume down + power.
Sorry if I'm not answering right away though, busy eating, and will be here and away for the next hour or so while I get ready for work =o( once I leave for work I'll only be able to help some more after like 2 hours or so. Hopefully we can do something before then though =o)

wase4711 said:
sounds like you never installed the htc drivers for your phone, hence your pc doesn't see the phone when you are doing ADB commands.
install the drivers for it, then try the ADB commands via your pc
and dont mess with the build prop or other system files unless you have a working back up and are 101% certain about what you are doing..
Click to expand...
Click to collapse
You're right, I didn't install the drivers. I did so and ADB was able to recognize it and I was able to access the bootloader. Thank you everyone for your help. I won't be making the mistake again.

SF-Echo18 said:
You're right, I didn't install the drivers. I did so and ADB was able to recognize it and I was able to access the bootloader. Thank you everyone for your help. I won't be making the mistake again.
Click to expand...
Click to collapse
So you'll be able to fix it from here on then? I was just about to link this thread to you as well should you have gotten adb to work again, it's for the RUU for Verizon seeing as you said you're on Verizon.
But going by your response up there you might already know how to fix this issue further :good:

BerndM14 said:
So you'll be able to fix it from here on then? I was just about to link this thread to you as well should you have gotten adb to work again, it's for the RUU for Verizon seeing as you said you're on Verizon.
But going by your response up there you might already know how to fix this issue further :good:
Click to expand...
Click to collapse
Indeed I appreciate it, but I just finished installing the RUU ha. Hopefully this thread will be of use to someone in a similar circumstance in the future.

Share another method of getting into recovery mode on non-responsive blank screen
Hi,
I just want to share how I accessed recovery mode with the same build.prop issue but with S-ON (might work with S-Off too).
I found the solution from here:
http://forum.xda-developers.com/htc...ter-download-mode-t2853100/page2#post62490577
To get into recovery mode on a non-responsive blank screen, hold the power button and volume up button at the same time and then approximately after 10 seconds, switch from pressing the volume up to volume down button before the HTC logo white screen shows while still holding down the power button. After, a white boot screen will give an option to go into recovery mode.

[SOLVED] Can not unlock the phone (lockscreen) & can not enter into fastboot mode

Hello.
This could be more general question so I try to get an answer here. Device: H815 wit bootloader unlocked. USB debugging is enabled but PC is not authorized so I can not execute any ADB command.
My problem is simple, I have flashed the latest Genisys rom and after initial setup (included lockscreen pattern setup) I restarted the phone. No I am not able to unlock the phone with correct lockscreen pattern provided. When I "connect" three dots it says "Try again", when I connect four and more dots it stucks and I can not swipe another pattern.
I am also unable to enter into recovery/fastboot mode (with power+vol down buttons). The phone starts booting instead of boot into the fastboot mode.
Is there any way how to flash anything or delete files containing lockscreen pattern?
Thank you very much for any help.
Babi
EDIT: Solved with LGUP.

when you attempted to go into recovery by holding power + vol down, did you let go of the power button and hold again immediately (while keeping vol down hold) when LG logo showed up?
anyways, if you can get ADP to detect your device, you can use this command to remove lockscreens
rm /data/system/locksettings.db
rm /data/system/*.key
or if you able to get into TWRP, find that folder and delete those files manually.
sorry i'm at work and can't type long, but let us(community) know.

Yes I did. I tried it with volume down button released as well. So I am not able to enter into fastboot mode. This issues persists.
I know about these commands, but how can I execute these commands without authorized device (ADB litsts "unauthorized" device)?
No, I was also not able to enter into recovery mode.

OnePlus 7T bricked on Qualcomm Crashdump mode, unable to boot to fastboot

Hey everyone!
So, I've got a HD1903, 8GB RAM 128GB ROM. I updated to OxygenOS 11.0.02, but it was still buggy as hell, so I decided to downgrade. I also had rooted the phone, and decided to get rid of that too. I went to the stock fastboot roms page, downloaded the 10.0.13 ROM and used 'flash-all.bat' file to clear everything. But halfway, it reboots, goes into recovery, then goes to Qualcomm Crashdump mode. That's it. No code or anything, just Qualcomm Crashdump mode, in Blue and Red letters. I tried to hold vol-up, vol-down and power to get into fastboot, but it just loads the fastboot splash screen, then goes back to the same qualcomm crashdump mode screen. Even if i try to hard reset it, by holding vol-up and power, it still goes to the same screen.
Anyone know what to do? I have no idea how to use the 'MSM tool' that everyone talks about, so any guiding advice would be great!
Thanks!

DM me here - https://www.facebook.com/prantor.khan.16 I'll help

HueyT said:
Click to expand...
Click to collapse
I didn't install TWRP, this was all on stock recovery. I also cannot get into fastboot mode.

Msmtool does not need twrp or fastboot--just the software, rom image, drivers, and button combo pushes and holding

OK, so I got it working again, thanks to the advice of reddit users, discord users and the latest msm tool and some googling. I held the vol-up and vol-down buttons for 30 seconds, then connected it to the laptop, with msm running, to a usb 2.0 port, and pressed start. hey presto, it worked. Thanks guys!!

scoped_ar07 said:
Hello
Using the MSM tool is very simple, you just have to download it from this link.
https://drive.google.com/file/d/12y3lO0wIgb2_LSDeVw9x_2C_HjbgZlb_/view?usp=sharing
NOTE: only works on Windows PC
1. Unzip the contents of the RAR into a folder.
2. Run the MSM application
3. Click Start.
4. Connect the cell phone in EDL mode (volume up + down button)
5. Wait for the process to finish (it takes a long time, please be patient)
6. The phone will restart automatically and a message will appear informing you that the equipment is damaged (don't be careful).
Note: The phone should automatically boot into fastboot mode and display a menu, but if it doesn't and instead boots to the T-mobile screen, you need to force shutdown with the power button for several seconds and then manually start it in fastboot mode. (volume up + volume down + power button)
7. Now you need to unlock the bootloader with the command from a Windows CMD window, but you need to download this ADB tool first.
https://dl.google.com/android/repository/platform-tools-latest-windows.zip
-Unzip the tool into a folder
-Open a Windows command window, in administrator mode and direct it to the path where you unzipped the ADB tool.
8- Execute this command while the cell phone is connected in Fastboot mode.
fastboot flashing unlock_critical
9- A question will appear on the phone in which you must allow the unlocking.
-With the volume keys select the option to allow it and press the power button.
-At this time your bootloader will be unlocked.
10. Copy the ADB tool files into the folder where ROM 10.0.13 is and replace everything.
11. With the phone connected to the PC, on the command line, run the flash-all.bat file
12. When the phone restarts and the yellow and white letters appear informing that the phone is not safe because the bootloader is unlocked, repeatedly press the (volume down) button until a menu in Chinese appears.
-PC will detect the phone again in fastboot mode and continue to flash
-Leave the phone and PC still until the process is finished.
-In the command line it will indicate that it cannot find files or partitions (ignore it)
13. Finally, the computer will restart automatically and you will be able to use it normally.
Notes:
1. If the phone after the flashing process with MSM starts up and shows the T-mobile logo, don't worry, just turn it off with the power button and connect it in fastboot mode.
2. Do not try to use it with the firmware that I install with MSM, as it will not work properly.
3. Before locking the bootloader again (if you plan to do so) first update via OTA, to the most recent version of Oxygen, otherwise the system will crash again and you will have to repeat the whole process.
Click to expand...
Click to collapse

Stronger1101 said:
Hi
Using the MSM tool is very simple, you just have to download it from this link.
hotdogt_11_O.01_190920 op7t tmo usa patched unlock bootloader.7z
drive.google.com
NOTE: It only works on Windows pc
1. Unzip the contents of the RAR into a
2. Run the MSM application
3. Click Start
4. Connect the cell phone in EDL mode (volume up + volume down button)
5. Wait for the process to finish (it is delayed)
6. A message appears informing that the equipment is damaged, do not be careful.
7- Now you must unlock the bootloader with a command from a windows CMD window, but first you must download this ADB tool.
https://dl.google.com/android/repository/platform-tools-latest-windows.zip
-Unzip the tool into a folder
-Open a windows command window, in administrator mode and direct it to the path where you unzipped the ADB tool.
8. Now run this command while the cell phone is connected in Fastboot mode.
fastboo ...
Hi
Using the MSM tool is very simple, you just have to download it from this link.
https://drive.google.com/file/d/12y3lO0wIgb2_LSDeVw9x_2C_HjbgZlb_/view?usp=sharing
NOTE: Only works on Windows PC
1. Unzip the contents of the RAR into a folder
2. Run the MSM application
3. Click Start
4. Connect the cell phone in EDL mode (volume up + volume down button)
5. Wait for the process to finish (it's time consuming, be patient)
6. The phone will restart automatically and a message will appear informing you that the equipment is damaged (don't be careful).
Note: The phone should automatically start in fastboot mode and show a menu, but if it doesn't and instead starts on the T-mobile screen, you must force shutdown with the power button for several seconds and then manually start it in fastboot mode. (volume up + volume down + power button)
7. Now you must unlock the bootloader with command from a windows CMD window, but first you must download this ADB tool.
https://dl.google.com/android/repository/platform-tools-latest-windows.zip
-Unzip the tool into a folder
-Open a windows command window, in administrator mode and direct it to the path where you unzipped the ADB tool.
8- Execute this command while the cell phone is connected in Fastboot mode.
fastboot flashing unlock_critical
9- A question will appear on the phone in which you must allow the unlocking.
-With the volume keys select the option to allow it and press the power button.
-At this moment your bootloader will be unlocked.
10. Copy the ADB tool files into the folder where ROM 10.0.13 is and replace everything.
11. With the phone connected to the PC, in the command line, run the file flash-all.bat
12. When the phone restarts and the yellow and white letters appear informing that the phone is unsafe due to having the bootloader unlocked, repeatedly press the (volume down) button until a menu in Chinese appears.
-The PC will detect the phone again in fastboot mode, and continue flashing
-Leave the phone and the pc still until the process is finished.
-In the command line it will indicate that it cannot find files or partitions (don't pay attention)
13. Finally the equipment will restart automatically and you will be able to use it normally.
Notes:
1. If the phone after the flashing process with MSM starts up and shows the T-mobile logo, don't worry, just force it off with the power button and connect it in fastboot mode.
2. Do not try to use it with the firmware that I install with MSM, as it will not work properly.
3. Before blocking the bootloader again (if you plan to do it) first update via OTA, to the most recent version of Oxygen, otherwise it will crash the system again and you will have to repeat the whole process.
Click to expand...
Click to collapse
Oh wow that was a long and well defined post. Thank you for taking the time to type it out.
As it happens, I fixed my issue already (IDK if there's a solved flair for XDA or something?). I downloaded the latest (10.0.15) MSM Tool from the XDA page, held the vol-up and vol-down for 30 seconds this time (as per advice from discord users) got the phone into edl mode, connected to a usb 2.0 port and let msm tool do it's thing. Everything is working perfectly now.

I've got the same problem but even with holding vol up+down buttons for 30 seconds I can't get into edl mode. It boots into qualcomm crashdump mode. I don't have fastboot working, I only see fastboot splash screen for a sec and then qualcomm crashdump mode appears. Could someone help?! As soon as usb cable is connected phone boots into qualcomm crashdump mode. no matter what I do.

Also do service centers undertake servicing for such phones which bricked because of badly flashed roms.

Āryan-9909 said:
Also do service centers undertake servicing for such phones which bricked because of badly flashed roms.
Click to expand...
Click to collapse
Yes, theyll just change out the motherboard

HueyT said:
Yes, theyll just change out the motherboard
Click to expand...
Click to collapse
If they're going to just change the motherboard, I wonder what the EDL mode is meant for. Anyways, I won't go for motherboard change one can buy a new and better phone at that kinda price.
Anyways, I Fixed it through EDL method, you have to hold vol up and down simultaneously and immediately connect to windows (while still holding both buttons) via original USB cable. Check with Device manager if your device shows up, it's easy enough but you might have to keep trying to you get it right. Thereafter, disable driver verification in windows and if Sahara communications failed message appears in msm tool, turn off phone and repeat the procedure again.

The repair peeps only fix hardware and not software. It's more cost effective for them to swap out hardware faster than messing with msmtool like us

Āryan-9909 said:
I've got the same problem but even with holding vol up+down buttons for 30 seconds I can't get into edl mode. It boots into qualcomm crashdump mode. I don't have fastboot working, I only see fastboot splash screen for a sec and then qualcomm crashdump mode appears. Could someone help?! As soon as usb cable is connected phone boots into qualcomm crashdump mode. no matter what I do.
Click to expand...
Click to collapse
OK, so you won't get any confirmation that you're in EDL modem you just have to wing it. What I did, I first opened the MSM tool on my laptop, connected the USB side to the laptop at a USB 2.0 port, and kept the USB-C side within easy reach. I held the buttons down with one thumb for 30-35 seconds, and while still holding them down with one hand, i connected the cable to the phone and clicked enum in MSM, it showed connected so I let the buttons go, and it didn't restart. I clicked start, and it worked for me.

scoped_ar07 said:
OK, so you won't get any confirmation that you're in EDL modem you just have to wing it. What I did, I first opened the MSM tool on my laptop, connected the USB side to the laptop at a USB 2.0 port, and kept the USB-C side within easy reach. I held the buttons down with one thumb for 30-35 seconds, and while still holding them down with one hand, i connected the cable to the phone and clicked enum in MSM, it showed connected so I let the buttons go, and it didn't restart. I clicked start, and it worked for me.
Click to expand...
Click to collapse
You don't have to hold buttons for that long, you can immediately connect it to PC. There is usually a sound to indicate that a new device has been connected to windows, you can also keep device manager open for confirmation. This video really helped.

After receiving a " qualcomm crash dump" , I was able to boot into recovery. Then I had done a factory reset.
Phone turns on fine, charges as well.
Although, On my Laptop / Desktop it does not see the phone within MSM, ASs well as ADB, Fastbootd or device manager.
I have the correct drivers downloaded.
Ideas ?

hightech316 said:
After receiving a " qualcomm crash dump" , I was able to boot into recovery. Then I had done a factory reset.
Phone turns on fine, charges as well.
Although, On my Laptop / Desktop it does not see the phone within MSM, ASs well as ADB, Fastbootd or device manager.
I have the correct drivers downloaded.
Ideas ?
Click to expand...
Click to collapse
Qualcomm 9008 drivers too?

HueyT said:
Qualcomm 9008 drivers too?
Click to expand...
Click to collapse
Yes.
I went ahead and ran another factory reset via recovery, no luck.

New cable, another PC?

HueyT said:
New cable, another PC?
Click to expand...
Click to collapse
Tried both, my desktop would always connect, adb, fastboot, etc.
I had just just freshly installed oneplus drivers including qualcomm on my laptop. Device was not recognized before driver installation or after.
Figure id try on my Mac, and linux laptop. no dice.
ADB is enabled.
Here are the drivers that are installed on my PC ( I enabled hidden devices, in order to see them ) These were recognizing prior to " qualcomm crash dump" . Not phone will not even be seen

Question Need help unbricking -> EDL not accessible for MSM

[SOLVED see post below]
Hi all,
Just bricked my Phone and can't access MSM. Hope you can help me. I will try to be very clear on the steps I took to get to this point.
Device: EU OnePlus 9 Pro
What is was trying to do: Go from rooted C.47 to Pixel Entended ROM
What I did:
Code:
Unrooted using Magisk uninstall option
Updated to c.48 through OTA
Go to lineageOS page on how to ensure all firmware partitions are consistent
very stupidly did not flash dtbo and vendor boot partition
did adb reboot fastboot in stead of abd reboot bootloader
Download the "lineage-19.1-20220701-recovery-lemonadep.img" and tried to temporaryly flash it by
fastboot flash boot <recovery_filename>.img
This resulted in the device getting stuck on the 1+ boot logo.
I can still force turn it off by holding Volume Up + Power.
When I try to access EDL by turned off and Vol UP + Vol Down + Plug and release, My PC makes a connection sound and the screen stay black for a while. After +- 10 seconds, the PC makes a disconnection sound and the phone boots up and gets stuck again on the 1+ bootup icon.
Also my phone won't stay turned off when plugged in the charger or pc

Yes, but what is it presenting as (i.e. EDL, fastboot, ADB, UMS...) when it connects?
If this is Windows, UsbLog.exe is handy to identify things popping up (as long as they have drivers installed).
For a list of devices that have ever tried to connect, try "enumusb.exe /l".
Both available here: https://www.temblast.com/windows.htm

Renate said:
Yes, but what is it presenting as (i.e. EDL, fastboot, ADB, UMS...) when it connects?
If this is Windows, UsbLog.exe is handy to identify things popping up (as long as they have drivers installed).
For a list of devices that have ever tried to connect, try "enumusb.exe /l".
Both available here: https://www.temblast.com/windows.htm
Click to expand...
Click to collapse
I will try this

I found the issue:
> EDL exits after 10 seconds if it is not captured by the MSM tool.
> The MSM tool only monitored 4 of my 10 USB ports
> So it was not captured because I was plugged in to an unmonitored USB port and rebooted after 10 seconds
> I have successfully used the MSM tool now

Oh! A bit off-topic, but I have never understood why EDL is commonly used over a "serial" port.
The interface that EDL presents is a generic USB bulk interface with two endpoints. You can use it just like that.
But no. They have to use a Qualcomm driver that makes it look like a "serial" port and then you can connect to that.
Me? I use a generic "WinUSB" Zadig driver. I have an EDL client that just connects to that fine.
So does the Python client implementation.
Also, I've never run into that 10 second timeout.

TraktorHenk said:
[SOLVED see post below]
Hi all,
Just bricked my Phone and can't access MSM. Hope you can help me. I will try to be very clear on the steps I took to get to this point.
Device: EU OnePlus 9 Pro
What is was trying to do: Go from rooted C.47 to Pixel Entended ROM
What I did:
Code:
Unrooted using Magisk uninstall option
Updated to c.48 through OTA
Go to lineageOS page on how to ensure all firmware partitions are consistent
very stupidly did not flash dtbo and vendor boot partition
did adb reboot fastboot in stead of abd reboot bootloader
Download the "lineage-19.1-20220701-recovery-lemonadep.img" and tried to temporaryly flash it by
fastboot flash boot <recovery_filename>.img
This resulted in the device getting stuck on the 1+ boot logo.
I can still force turn it off by holding Volume Up + Power.
When I try to access EDL by turned off and Vol UP + Vol Down + Plug and release, My PC makes a connection sound and the screen stay black for a while. After +- 10 seconds, the PC makes a disconnection sound and the phone boots up and gets stuck again on the 1+ bootup icon.
Also my phone won't stay turned off when plugged in the charger or pc
Click to expand...
Click to collapse
Your phone needs to be in OFF state mode when you're using EDL.
So, very simple:
Enter bootloader mode by holding both volume buttons with the power button together till your phone restarts and enters the bootloader.
From the bootloader screen you can use the volume buttons to navigate through the choices and you can select "Switch off".
When you complete this, you need to hold both volume buttons, and while holding them connect the cable (PC).
If you don't have or you don't have the correct Qualcomm EDL drivers installed, your phone will reboot or start to boot, it won't stay in EDL mode for longer than 10 seconds.
I also got the correct drivers for you, but you need to install the drivers manually while your device is in "EDL" mode, so, you need to be a bit "fast".
I have even a video for you, but need to upload it to YouTube so you can watch it.
I'll share you here the drivers just in case if you're familiar with a manual installation of the drivers.

ekin_strops said:
Your phone needs to be in OFF state mode when you're using EDL.
So, very simple:
Enter bootloader mode by holding both volume buttons with the power button together till your phone restarts and enters the bootloader.
From the bootloader screen you can use the volume buttons to navigate through the choices and you can select "Switch off".
When you complete this, you need to hold both volume buttons, and while holding them connect the cable (PC).
If you don't have or you don't have the correct Qualcomm EDL drivers installed, your phone will reboot or start to boot, it won't stay in EDL mode for longer than 10 seconds.
I also got the correct drivers for you, but you need to install the drivers manually while your device is in "EDL" mode, so, you need to be a bit "fast".
I have even a video for you, but need to upload it to YouTube so you can watch it.
I'll share you here the drivers just in case if you're familiar with a manual installation of the drivers.
Click to expand...
Click to collapse
Thanks for the help. The problem ended up to be a bit different than this for me, but this is a good post for anyone to find in the future!

Help removing PIN lock

Hi all,
I've been researching this phone for a while and I thought I'd take a chance on a functioning phone with a PIN lock. The phone turns on just fine but prompts for the pin when fully booted. I've been away from Android for a few years, but I can't seem to get into recovery mode no matter what I try. Vol down + power just boots to safe mode (pin still needed) and vol up either buzzes 3 times and does nothing or doesn't boot at all. Even tried with headphones plugged in USB port.
I was hoping that once in recovery mode I could wipe device or at least execute some ADB commands, but this is proving to be more difficult than expected. Also plugging into PC while on or off does not seem to appear in device manager, and no device is made in Windows. Are there any options here or should I just try to return to seller?
Thanks

try 'fastboot oem unlock' to factory reset device