How To Guide Unlock bootloader and root A125U u3

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Professorwhiz

Member
Oct 30, 2022
6
0
Requirements:
-Tested working on firmware A125USQS3BVA2
-A MTK bootloader unlocking tool, tested working with UnlockTool
-This is for A125U on binary 3 ONLY

Special thanks to @Boster27 for translate guide and test method


Steps:

1- Boot into Download Mode (vol+ & vol- & pwr) and flash this custom BL file BL_A125.tar with ODIN patched using the BL button. The device will reboot to an error screen, this is normal.

2- Boot into BROM mode using Test Points (picture attached, needs light dissasembly). Using UnlockTool or your MTK tool of choice, head to the Samsung section and select A125, then on the BROM tab, choose Unlock Bootloader.
After this the device should reboot into recovery and perform a factory reset automatically. In case it doesn't, go into recovery manually (vol+ & pwr) and perform a factory reset. After this the device should boot normally.

3- Once the setup process is complete, connect to Wifi and enable Developer Options to confirm that OEM Unlock is enabled and unlocked. Install the latest version of Magisk Manager and use it to patch the AP file for the corresponding firmware.

4- Boot into Download Mode, make sure the AutoReboot option is unchecked in ODIN, and flash the magisk_patched.tar AP file, and the stock CP, CSC and USERDATA files. Then manually boot into recovery and perform a factory reset. After this the device should boot normally.

5- Once the setup process is complete again, connect to Wifi and enable Developer Options to confirm that OEM Unlock is still enabled and unlocked. Install the latest Magisk app and launch the app.
It should show a dialog asking for additional setup. Let it do its job and the app will automatically reboot your device.

And done! Phone is rooted on binary 3!
I have a sm-a125u1 will it work the same?
 

HTidwell

Member
Oct 24, 2017
13
0
Micromax IN Note 1
(Any idea if its possible to unlock bootloader on a125u on binary "s5"?
asking same about 5 - could the same process work with an updated modded BL? if so is it hard to create?

alternatively Ive seen a few articles on making your own combination firmware (since I havent seen any higher than 2) but there seems to be disagreement on how and if they are "real" (effective). It seems hard to believe its as simple as just unzipping and rearchiving the boot.img and ap files - given the file size of legit combination files... but willing to try anything.

Thanks in advance for any sage wisdom, hunches, ideas or input you may have. . H
 

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  • 3
    Requirements:
    -Tested working on firmware A125USQS3BVA2
    -A MTK bootloader unlocking tool, tested working with UnlockTool
    -This is for A125U on binary 3 ONLY

    Special thanks to @Boster27 for translate guide and test method


    Steps:

    1- Boot into Download Mode (vol+ & vol- & pwr) and flash this custom BL file BL_A125.tar with ODIN patched using the BL button. The device will reboot to an error screen, this is normal.

    2- Boot into BROM mode using Test Points (picture attached, needs light dissasembly). Using UnlockTool or your MTK tool of choice, head to the Samsung section and select A125, then on the BROM tab, choose Unlock Bootloader.
    After this the device should reboot into recovery and perform a factory reset automatically. In case it doesn't, go into recovery manually (vol+ & pwr) and perform a factory reset. After this the device should boot normally.

    3- Once the setup process is complete, connect to Wifi and enable Developer Options to confirm that OEM Unlock is enabled and unlocked. Install the latest version of Magisk Manager and use it to patch the AP file for the corresponding firmware.

    4- Boot into Download Mode, make sure the AutoReboot option is unchecked in ODIN, and flash the magisk_patched.tar AP file, and the stock CP, CSC and USERDATA files. Then manually boot into recovery and perform a factory reset. After this the device should boot normally.

    5- Once the setup process is complete again, connect to Wifi and enable Developer Options to confirm that OEM Unlock is still enabled and unlocked. Install the latest Magisk app and launch the app.
    It should show a dialog asking for additional setup. Let it do its job and the app will automatically reboot your device.

    And done! Phone is rooted on binary 3!
    1
    I was able to do it, thanks.
    I wrote full firmware, wiped and started from scratch, everything went ok, thanks
    1
    You write the BL_A125.tar, disconnect the battery and unlock the booloader, after this it enters without problems and is deleted.
    If it doesn't, disconnect battery and force enter recovery with volume up and power, do a factory reset
    Thanks for helping. I rooted 4 note 4s and they all finally give out so I am going to try a newer phone
    1
    Do you mean A21 or A12? please clarify what model phone you're referring to.
    I do mean A21 as I own one, it was only sold in the USA and Canada. It has the same CPU as the A12.