How To Guide Unlock bootloader and root A125U u3

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mfeliu07

Member
Mar 17, 2009
37
1
Habana
Thanks for helping. I rooted 4 note 4s and they all finally give out so I am going to try a newer phone
you must do test point
images.jpeg
 
Hi, i rooted my A12 with your guide thank you for that.

Do you know the fix for unknown baseband and no imei?
Try this many people reports to be working on most a125 variants

 

Andy Rivera

Member
Jun 19, 2008
24
2
La Ceiba
Try this many people reports to be working on most a125 variants

Already tried that, but when i delete the nvimei folder and reboot the problem persists still no imei or baseband
 

tx9tuhin

New member
Apr 30, 2022
4
0
Thanks for sharing the method. can I unlock the region lock to use any sim card? and the unlocking tools seem paid and it has a minimum 3 month subscription which i don't need. do you have any free mtk bootloader unlocking tool?
 
Thanks for sharing the method. can I unlock the region lock to use any sim card? and the unlocking tools seem paid and it has a minimum 3 month subscription which i don't need. do you have any free mtk bootloader unlocking tool?
 

hi, I've tried test point, clk+ground can't get into brom, a-125u its a boost carrier locked phone. anything i should i try?
There has to be a way because I have the same model and it's a TMobile or MetroPCS phone. Def not boost , I'm trying to find a way also... Showing a picture of the guts of my phone and saying "test point" doesn't tell me anything at all. We need actual instructions that don't assume we're electrical engineers..... Only thing I can think of is I know there is a 7 day timeout before you can even enable oem unlock in dev options so if it hasn't been 7 days or you haven't enabled that yet that's the problem.
 

tx9tuhin

New member
Apr 30, 2022
4
0
There has to be a way because I have the same model and it's a TMobile or MetroPCS phone. Def not boost , I'm trying to find a way also... Showing a picture of the guts of my phone and saying "test point" doesn't tell me anything at all. We need actual instructions that don't assume we're electrical engineers..... Only thing I can think of is I know there is a 7 day timeout before you can even enable oem unlock in dev options so if it hasn't been 7 days or you haven't enabled that yet that's the problem.
ive spent all day just trying to get into brom, all over the internet not a single video or article with clear instruction, all they are doing just connecting the testpoint plugging the cable and boom brom mode.. and mine doesn't say anything it just boots into download mode after 5 seconds. i even tried opening the metal shield of the chip back on the board to find clk resistor still didn't work. what a frustration! well, 7-day timeout might be the case. Oh, Samsung
 

Wish39

Senior Member
Jan 13, 2015
199
51

hi, I've tried test point, clk+ground can't get into brom, a-125u its a boost carrier locked phone. anything i should i try?
There has to be a way because I have the same model and it's a TMobile or MetroPCS phone. Def not boost , I'm trying to find a way also... Showing a picture of the guts of my phone and saying "test point" doesn't tell me anything at all. We need actual instructions that don't assume we're electrical engineers..... Only thing I can think of is I know there is a 7 day timeout before you can even enable oem unlock in dev options so if it hasn't been 7 days or you haven't enabled that yet that's the problem.

I'm assuming you guys are on the newest firmware. Samsung patched up BROM mode in the February 2022 security update, that's why mtkclient or in some cases testpoint will not work, my A21 does not enter BROM anymore as well after that update. Try downgrading to this firmware: A125USQS3BVA2, that's the January 2022 security patch firmware and is not patched up.
 
I'm assuming you guys are on the newest firmware. Samsung patched up BROM mode in the February 2022 security update, that's why mtkclient or in some cases testpoint will not work, my A21 does not enter BROM anymore as well after that update. Try downgrading to this firmware: A125USQS3BVA2, that's the January 2022 security patch firmware and is not patched up.
God bless you , I can just downgrade like that with Odin? I thought Samsung could only move up in binary number when you flash, never down ? But if so that's awesome. *Update* yeah that didn't work lol still won't go into brom and still no oem unlock toggle... It took the firmware tho so there's that
 
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Wish39

Senior Member
Jan 13, 2015
199
51
God bless you , I can just downgrade like that with Odin? I thought Samsung could only move up in binary number when you flash, never down ? But if so that's awesome.
If the older firmware is the same binary number then yes you can downgrade. In your case the binary version is still 3 so you can downgrade. For my A21 I can't downgrade because the old firmware is on binary 5 and the patched firmware it is on now is binary 6.
 

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  • 2
    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.