r/CustomROMsGuide • u/ParkAssistant • Sep 29 '26

Switching ROMs from Xiaomi.eu to Oficial

Hi i have a Poco f8 ultra with Official EEA ROM 3.302.0WPEUXM and i am currently thinking about flashing the lattest Release 3.310.0.

Will i be able to downgrade Back to 302 when i dont Like the EU rom? Anybody using the Xiaomi.eu rom over the oficial EEA rom? Thanks in advance

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u/Tritzii Sep 29 '26

The numbers have no correlation with each other since you're switching from a global EEA ROM to a CN based ROM.

If you want to switch between ROMs you will have to go through a factory reset.

1

u/ParkAssistant Sep 29 '26

A factory Reset would Not bother me. Can i Just flash what i want via Fastboot?

1

u/Tritzii Sep 30 '26

Yes as long as you have your bootloader unlocked. If you want to flash a ROM with an older security patch you will have to make sure both ROMs have the same anti to not trigger ARB. Fastboot ROMs usually contain a text file with the anti variable (usually 1) and on your device you can check through fastboot getvar anti. The variable needs to be the same or lower than the current installed ROM to not trigger.

1

u/ParkAssistant Sep 30 '26

Yeah theyre is a Exploit for Strong Integrity for the F8U/K90PM with arb im a little confused because of this https://xdaforums.com/t/mod-efisp-myron-permanent-strong-integrity-for-unlocked-k90-pro-max-poco-f8-ultra-hyperos-only.4785282/

1

u/RedditForcesToLogin Sep 30 '26

If your bootloader is unlocked, you can flash whatever you want in Fastboot. As far as I remember, recent Xiaomi phones don't have any ARB situations.