Some questions about bootloaders, VoLTE on G9600 (SnapDragon) - Samsung Galaxy S9 Questions & Answers

I have the Latin America Snapdragon S9 G9600 with Oreo and using it with Mint Mobile (T-Mobile ) in the US
Have a few questions:
1. If I update it to Pie or 10 , bootloader will get updated. Is it possible to come back to Oreo by flashing stock ROM with Odin without root? Will that trip Knox?
2. Same question but if phone is rooted
3. VoLTE and WiFi calling is not working. Has anybody gotten those to work on G9600 or G9650 ?

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BRE5

Unrooted Exynos model. Updated via OTA to BRE5 and now VoLte isn't working anymore. I'm on MetroPCS/T-Mobile. It was working fine on the last version.
Anyone experience the same thing?
Are you on G960F model?
SantinoInc said:
Unrooted Exynos model. Updated via OTA to BRE5 and now VoLte isn't working anymore. I'm on MetroPCS/T-Mobile. It was working fine on the last version.
Anyone experience the same thing?
Click to expand...
Click to collapse
Exynos is the international S9, chances are the CSC (Which controls features such as VoLTE) is wrong for your region if you are using a US carrier, not sure why it would have been working previously though as the firmware for Exynos does not include any US regions in the first place
Either flash back to the previous working version, or try flashing just the CSC from that firmware, or test a few other firmwares for that model S9

S9 Exynos US csc question

I have a rooted Exynos s9 with soldiers rom on it. I'm wondering if in order to get the cricket csc on it I would have to first flash the cricket firmware and then flash a custom rom? Or would I have to stay on the cricket firmware? The reason for asking would be to maybe enable wifi calling.

Is it possible to install USA AT&T or TMob firmware on G9600 and root it

I'm planning to get the G9600 since the Exynos has battery issues.
I don't need to install a lot of custom ROM's , I'll be happy with rooted stock and microG, even though I see that TWRP and unofficial Lineage is already available for the 9600
If I need to use VOLTE and HD Voice on ATT or T-Mob, do I need to install the US firmware? If yes, is it possible to root the USA firmware since the 9600 has an unlocked bootloader?

What firmware I can flash on my Samsung note10 + SM N975u

hello everyone , I just bought a Samsung note10+ with SM-N975u verizon rom. I noticed that Note10 + come with 2 modal which is Snapdragon and Exynos.
With this Verizon rom it is quite annoying to me because I'm using it in Malaysia and all the services from Verizon useless for me. I got few questions before I try to flash my rom into other version.
My devices is unlocked , I can use Maxis & Digi sim card for now.
1. Can SM-N975U flash into SM-N975F? (SM-N975U is snapdragon & SM-N975F is exynos)
2. If I cannot flash into SM-N975F , which firmware I can choose to flash ? (any firmware without Verizon/ AT&T but come with google services)

Question S21 FE Verizon V2 (Exynos) possible to flash U1 XAA unlocked firmware?

Hi,
thanks in advance for your time. In the past, I have used a patched odin to remove Verizon firmware from Samsung galaxy phones and flash the U1 XAA unlocked firmware on them. I just got my hands on a new V2 S21 FE from Verizon. I tried the normal process and it did not work. I assume because of the different CPU. Is there a V2 unlocked firmware out there anywhere?
Thanks again.
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