UMIDIGI Z2 series: Repair IMEIs and Google certificate

bencebacsi

UMIDIGI Z2 series: Repair IMEIs and Google certificate

after full flash format or flashing an incompatible or badly assembled custom ROM

This guide is about how to repair your lost IMEI numbers and Google certificate on UMIDIGI Z2 (original and upgraded), Z2 Special Edition and Z2 Pro with a special version of MediaTek SN Writer tool.



Please note, the Google certificate recovery (Attestation Key) will work only if you have already reactivated your fingerprint scanner. Please visit the Recover dead fingerprint scanner after full flash format thread. If your fingerprint scanner is not yet alive (but you've set an Attestation Key file), you'll get an error message at the end of the flashing process but your new IMEIs and other wireless IDs will be still flashed.

What you need:

• VCOM drivers: Windows 10 already automatically can install it.
• The same version of SP Flash Tool compatible STOCK ROM, that you have installed on your phone downloaded on your PC - Find your device here: http://bit.ly/UmidigiROM
  

• SN Writer Tool G37: SN_Writer_G37_v1.1752.rar
  

Let's get started step by step (the driver installation process will be skipped in this tutorial)
You have to power off your phone before Step 12.!


1. Extract and open the folder of SN Writer G37, then open the application by double clicking SN Writer.exe.



2. Set ComPort to USB VCOM and Target Type to Smart Phone (as it's shown on the picture below).



3. Click on the System Config button, then select all items that you can see checked below.

You may uncheck everything if your only target is to recover your Google certificate.


4. Load the Modem_1 database file (click on MD1_DB button) located in the stock firmware folder.

Note: You have to use the database files of the same version of ROM that you have installed on your phone!


5. Load the AP database file (click on AP_DB button).



6. Click on Save button.


7. Enable AutoGen as shown on the picture below. (BT and Wifi addresses will be auto generated)

You may ignore this step if you flash only the Attestation Key (Google certificate).


8. Select Key Files and Attestation Key as sown below.
Only if your fingerprint scanner is already recovered with Beanpod Activation tool.


9. Click on the Attestation Key button and brows for your key file, Open it, then OK.

The file name is identical to the first software release of your phone. The same file can be used for any software versions of the same phone model.


10. Click on the Start button.


11. In the pop-up window set your original(!) IMEI_1 and IMEI_2 numbers, then click OK.

This pop-up window will not appear and ignore this paragraph if you flash only the Attestation Key.


12.  Connect your (powered off) phone to USB, without pressing any buton.
The writing process will start automatically while your phone is switching into META mode.

Troubleshooting: If the process gets stuck at this point what the screenshot shows above (Start searching kernel...), disconnect the USB cable for a few seconds, then reconnect it and the process will continue. If the flashing process still fails, start again the flashing but leave your phone connected. Press and hold the power button until the flashing process starts, then release it.


13. After the writing process finished, you get the following screen, reporting the successful process, and your phone automatically switches into charging mode.

Now you are DONE and may power on your phone.
Congratulations!


In case of a bad connection, not properly installed drivers, you loaded incompatible DB files or if something other trouble happens, you get the following screen.

Check your USB cable, use another USB port, when the phone switched to META mode, check your Windows device manager to see if a new serial port is correctly installed.

After reboot your phone, check the new IMEI numbers in Settings --> System --> About phone --> Status --> IMEI information.


All the screenshots are captured and the guide is written by me for UMI users. Unauthorized copy of this content is prohibited. Please let me know if you find errors or missing info.
Thank you, bencebacsi

Veiran

Does this MediaTek SN Writer tool only work for the Z2 series, or will I be able to use it for my F1? I have the F1's firmware and would substitute that instead of the Z2's, however I am missing the Attestation Key file.

bencebacsi

Veiran replied at 2019-2-22 23:34
Edited by Veiran at 2019-2-22 23:56  

Does this MediaTek SN Writer tool only work for the Z2 serie ...

For the F1 use this tool: http://www.mediafire.com/file/up ... .0-vturkey.rar/file
Attestation key is not provided, just flash your IMEIs. You'll get an error message at the end of the flashing process but just ignore it. Reboot your phone, connect it to the internet, wait for a few minutes (your google certificate will be installed from the internet in the background), then reboot your phone again.

Veiran

bencebacsi

Veiran replied at 2019-2-23 23:03
Edited by Veiran at 2019-2-23 23:09  

Edited by Veiran at 2019-2-23 23:06  

Hi, As the title says, this tool is for the Z2 series. For the F1 please use the standard SN Writer. Link: https://community.umidigi.com/forum.php?mod=viewthread&tid=1375
To remove the red text error message on the F1 you need to use another SN Writer variant.
Link: http://www.mediafire.com/file/up ... .0-vturkey.rar/file

Veiran

bencebacsi replied at 2019-2-25 12:12
Hi, As the title says, this tool is for the Z2 series. For the F1 please use the standard SN Writer ...

Thank you. I'll send new responses to that thread.

bencebacsi

Veiran replied at 2019-2-26 08:20
Thank you. I'll send new responses to that thread.

The F1 repair guide has been added to this section.

dedeziber

i have a trouble my imei from my device umidigi z2 ...and  i follow step by step ?? but in step no 12 ....can't u help me
my system opration : win 10 pro ....if trouble driver ? can't u show me ...about vidio tutorial how to install driver MTK or preloader

Fausto

dedeziber replied at 2019-3-25 22:13
Edited by dedeziber at 2019-3-25 22:15  

i have a trouble my imei from my device umidigi z2 ...and ...

I have the same problem! MTK driver installed twice  but exactly same message every attempt!!
can you help me??

rmarcus

I have the same message as well, any luck on how to fix it?