Treble roms on G9650 - Samsung Galaxy S9 Questions & Answers

Hello.
I bought a G9650 in Mexico.
I succesfully installed TWRP but when I flash a GSI image, the phones boots when is Oreo, but gives an error screen saying that the vendor partition is outdated. When the GSI is Pie, the phone only gets into the Google animation bootscren, one second and booom, reboots.
I'm starting to think that a custom kernel is needed in the Pie roms but I couldnt find any custom rom for this S9 plus model.

Anybody?

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How to upgrade to the latest working custom ROM image to Samsung A300FU

Phone:-
Samsung A3 2017 - White case
Problem:
Can got into developing mode. But, no option to unlock the OEM. Try changing the date. But, failed.
Tried so far:-
I was able to install and run TWRP_2.8.7.0_A3_F-H-FU_5.0.2_v2. But, it failed to install any custom ROM images. Just failed with error. But,
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Can i install LineageOS 18 (Android 11) on my S20+ that has been upgraded to official OneUI 4 (Android 12)

Hi,
as the title states, I am looking at installing LOS 18 on my S20+ (I know LOS 19 is out, but i need the older version).
My phone currently is fully stock (boot loader locked) and on OneUI 4 (Android 12).
A quick search on the forums seems to indicate it's not possible to downgrade to an official Android 11 ROM on the phone even using ODIN.
the device as an exynos device.
i managed to get it to work by installing the Android 11 stock rom using odin.
the first attempt it got stuck on boot loop, then I attempted using the HOME_CSC file, it got stuck at prism.img
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even then plugging in the USB, OdIN was able to detect it and trying installing it again worked.+

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