Wake up this morning with BOOTLOOPS for the second time! - Lenovo Vibe K5 Plus Questions & Answers

Hello all
last weekend i left my phone charging and went to sleep, when i wake up in the morning the phone was in a BOOTLOOP, cant boot at all.
I was using from months lastest version of LINEAGEOS (https://forum.xda-developers.com/k5-plus/development/rom-lineageos-14-1-t3556180) everything running OK, no problems!
Tried everything to revert the bootloop without wipe my personal data, but unfortunately without sucess!
* tried wipe cache
* tried reflash lineage
* tried reflash old versions of lineage
Everything... no sucess... bootloop!
ok, new life... wiped DATA, SYSTEM, CACHE.. and flashed a new ROM AOSP EXTENDED. phone system booted (https://forum.xda-developers.com/k5-plus/development/aospextended-rom-v4-1a6020-aosp7-2-1r4-t3591522)
have used AOSP EXTENDED for a WEEK.. so today when i wake up, BOOTLOOPS! AGAIN!
My recovery: 3.1.1 - K5/K5-PLUS Shreps
Phone model: A6020I36
More tests that i have made:
Tried CLEAN INSTALL ROM = boot ok!
after tried to RECOVER only my DATA = BOOTLOOP
Tried RECOVER all partitions = BOOTLOOP
any help? dont want to loose all my personal data and configs again!

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If you want to start a fresh then go into recovery and wipe all the partitions, boot, system, data, cache, android_secure, ext then flash a rom
I did all that :-(
I even did a complete format of my sd card, re-partioned it.
Maybe i should do it again ?
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Thx for the reply,
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Need a little help:
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Phone keeps Crashing on Boot animation, No iMEI, Wifi, Bluetooth. Restart loop.

This a bit of a long short story, so please bear with me for a while.
I first unblocked my Lenovo K5 Vibe Plus a6020a46 (India) in 2017 and using TWRP I had flashed the AEX Oreo v5.7 ROM. It was a great change and everything else was working fine for a long time.
Fast forward to 2020, I felt the phone was slowing down so I clean flashed AEX Pie v6.7 using TWRP, the ROM worked slick but after some time weird problems started to rise. Here's the chronology of what happened:
1. While using some apps the phone used to freeze, then shutdown. A restart would solve the problem for a while. But the lag used to remain.
2. The same problem repeated after a while but this time the phone went into bootloop.
3. I wiped cache, tried other solutions but nothing worked out so I reflashed the same ROM after a clean wipe. Phone worked fine for a week but then slowed down and finally crashed (This happened 2 times.)
4. After a week it was different, this time the boot animation would get stuck, then the phone would crash. So I reflashed again but when I booted up the phone there was no SIM service, no iMEi, No Wifi, No IP, Bluetooth.
5. I thought this AEX Pie ROM to be a problem so I flashed Arrow OS, Paranoid OS, AEX Oreo version, AEX 10 version but the problem remained: The phone would boot, boot animation stuck, and the phone would crash. This loop is where I am now.
I followed THIS GUIDE and tried reverting back to Official Stock ROM using QFIL. The flash was successful but the phone wouldn't bootup and went into a restart loop.
Here are some more important details:
1. The recovery mode is working fine. I can flash and wipe but I sometimes get the error of "Unable to mount" on Data, System and Cache partition which is solved with a format.
2. I can also get into Fastboot mode, EDL mode for QFIL flash.
3. I can also view all files and folders from TWRP Filemanager.
TLDR; Phone keeps crashing on boot, reverting to stock ROM also leads to restart loop, the phone shows no SIM, Wifi, iMEi, IP, etc. Tried wipe, clean flash, format which is successful but the problem remains. HELP!
"4. After a week it was different, this time the boot animation would get stuck, then the phone would crash. So I reflashed again but when I booted up the phone there was no SIM service, no iMEi, No Wifi, No IP, Bluetooth."
This is caused by bad ROM flashing ( when your flash wasn't entirely successful). You can fix this by reflashing. This could also happen if you downgraded, so go back to the version uou were on and see if this did it. You can fix IMEI with root if you want, I saw a thread for another phone: https://forum.xda-developers.com/g5-plus/how-to/fix-persist-resolve-imei0-explanation-t3825147 see if this could help.
"Animation Stuck"
This could be a problem with the ROM and data/cache, try factory resetting. Otherwise, it is also a problem with the ROM
In any case, I would redownload and reflash Stock ROM again and see if it still happens.

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