Question Query regarding OS Downgrade on Poco F4

[binary**#]

True to my knowledge, if the Rollback Index of the Fastboot ROM is less than the current device rollback index, then we cannot flash that ROM as it will trigger Anti Rollback Mechanism, which might end up hard-bricking the device.

In my case as well, my Poco F4 running Android 13 has an ARB of 1 whereas the Android 12 Fastboot ROM that I have has an ARB value of 0, so this means downgrading should not be possible.

However, I have seen across other Xiaomi device forums on XDA wherein users did manage to perform a downgrade simply by flashing the downgrade firmware via Mi Flash Tool.

So is there something specific going on with Poco F4 or I'm missing a point there? Any insights on the same will be highly appreciated.

 

[Alfian Febian]

Don't worry about downgrading OS version from 13 to 12, you just need UBL... and you can flash ROM from anywhere, global, EU, Thailand and more.

Jangan khawatir tentang menurunkan versi OS dari 13 ke 12, Anda hanya perlu UBL ... dan Anda dapat mem-flash ROM dari mana saja, global, UE, Thailand, dan lainnya.

Mod. edit: post translated. alecxs

 

[binary**#]

Don't worry about downgrading OS version from 13 to 12, you just need UBL... and you can flash ROM from anywhere, global, EU, Thailand and more.

Jangan khawatir tentang menurunkan versi OS dari 13 ke 12, Anda hanya perlu UBL ... dan Anda dapat mem-flash ROM dari mana saja, global, UE, Thailand, dan lainnya.

Mod. edit: post translated. alecxs

Well, this is what I knew in theory as well. But in practice that doesn't seem to be the case. Aa far as I know, you could only flash a ROM if its Anti Rollback [ARB] Index is equal to or greater than your device's ARB.

And after updating my Poco F4 to Android 13, its ARB is now 1. On the other hand, all the Fastboot ROMs that I have tried to date [Android 12, Android 13, Global, India, etc] have the ARB 0 and hence they all refuse to flash due to the rollback index. Just to be double sure, I took the risk and proceeded ahead to flash them, but the Mi Flash Tool straightaway refused it due to ARB.

So is there any other way out of getting this job done? Because as of now, I could only go from one custom ROM to another, but cannot flash the stock Fastboot ROM. [And yes, my bootloader is unlocked throughout the process].

 

[Alfian Febian]

let me know your failure image I will tell you the lines you have to remove so that it doesn't fail on flash.

beri tahu saya gambar kegagalan Anda Saya akan memberi tahu Anda garis yang harus Anda hapus agar tidak gagal saat flash

Mod. edit: post translated. alecxs