[HELP] Locked Bootloader on Xiaomi 13 Ultra (CN) - Can't Reinstall Xiaomi.EU or Global ROM


LuciAndreMS

Members
9 Nov 2023
3
13
Hi everyone,
I'm using a translator to write this, so I apologize for any errors or strange phrases.

I’m from Brazil and I have a Chinese Xiaomi 13 Ultra (ishtar), which came with the bootloader already unlocked and running MIUI with the Xiaomi.EU ROM.
I upgraded to HyperOS as soon as it was available, and everything worked fine.
Recently, I had to format the device and reinstall my apps. That’s when WhatsApp stopped working, showing a message saying I needed to install the official version, even though I was already using it.

After doing some research, I found the issue might be related to the unlocked bootloader and the custom ROM I was using.
So, I followed a YouTube tutorial, downloaded the China (CN) ROM (assuming it would support Portuguese), and flashed it with the bootloader locked, hoping that would solve the WhatsApp issue.

Since then, my phone has been a complete mess:
  • Conflicts with Brazilian banking apps
  • Several apps don’t work correctly
  • Most system messages are in Chinese
  • And now... I can’t unlock the bootloader again
I reached out to NCUNLOCK via WhatsApp. They offered to do a bootloader unlock for $80 USD, providing me two files:
  • V14.0.20.0.TMACNXM_20231011.0000.00_13.0_cn_chinatelecom_b08074c273 (8.5GB)
  • MI 13 ULTRA ENG ROM (3.2GB)
They said they would perform a downgrade and then unlock the bootloader.
But $80 USD is not an option for me right now, it’s nearly one-third of the minimum wage in my country.
I’ve been trying to fix this for days, without success, and it’s been very stressful. This phone is really important for both my work and daily life.
If anyone out there has any knowledge, tools, or can guide me on how to safely unlock the bootloader again and return to Xiaomi.EU or Global ROM, I would truly appreciate it.
Any help would mean a lot right now.
Thanks in advance!
 
Last edited:
My understanding is that you cannot unlock China devices currently

 
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I’ve updated the post with more context and details.
It’s been days, and I really need help to fix this. This phone is crucial for my daily life, and I’m getting desperate.