Question [SOLVED] Samsung A12 / SM-A127F/DSN - Root problem

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New member
Nov 22, 2011
1. Did you root using the full ap file patched with the special a217 magisk? (This contains the patched boot.img and vbmeta.img)

You can't downgrade firmware
yes, I patched the full AP with the special magisk version. I followed the steps at this post at first, and then I found the tg channel for Exynos 850 devices so I'm following guides there

Sorry I mean downgrade the baseband version, I flashed the A127FXXU4AUK1 that I saw it is widley used for this device, but I have the same problem, not able to mount /system folder.
In recovery mode with MTP seems that I can mount system, but when I restart the device I cannot interact with that folder, also mounting /system from a terminal with root access (recovery or termux) result in fail, with the same error pasted here

I also tried to install the TWRP and OFox recovery following the guides on tg, with no luck.
Only the OFox one is working for me, I tried also the others recovery but they are causing boot loop

My a127f/DSN comes with baseband A127FXXS4AVB2 (ITV) [security update 02/2022] from factory, I'm afraid this is the reason why I cannot access to the system folder.

In any case, thank you very much for your support :)


Senior Member
Oct 23, 2021
HTC Wildfire S
Samsung Galaxy A20
Hi, Yes I have root on this device !
It's very simple, but official Magisk have a bug which prevents the device from booting properly and your phone will be stuck with in bootloop.

1. You must get custom patched Magisk (jn attachment) - from This thread and install it on phone.
2. Get your original firmware from :
3. Unpack your firmware and upload AP_XXXXX file on phone and patch it with magisk.
4. Flash with ODIN and done :)

You have full instruction : Here but I recommend patch full AP_XXX file not only boot.img. Full AP patch It will allow you to turn off DM-Verity immediately and trouble with vbmeta.
i tried twice with original magisk and it worked? maybe it is only for you

my device: a127f/dsn


New member
Feb 10, 2023

I have problem with patch my boot.img with Magisk manager. After patching I got error : "The phone is not running Samsung's official software". After flash again stock boot.img everything works.

I use Odin to flash.

I tried to install unofficial TWRP from other thread but I got SVD Fail and vbmeta errors during boot.

Somebody have any idea how solve this problem?

Model : SM-A127F/DSN
Baseband version : A127FXXU2AUG7
Android 11 (UI 3.1)

Info from download mode :
KG STATE : Checking
Secure Download : Enabled
RP SWREV : B:2 K:2 S:2

I found similar situation on movie :
But for me recovery mode and factory reset not solve problem. Phone stuck on "Samsung's official software" and reboot after a few minutes.

Best Regards
did you ever fix it

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