Mi 11 ultra unlock bootloader with replaced motherboard

[K9vis]

I want to unlock the bootloader of the Mi 11 Ultra, its motherboard was changed. I tried the official way, which is through Mi Unlock and I couldn't, it says that the cell phone is not registered on the server or something like that, any ideas?

edit: I did some research and saw that I have the global ROM on a Chinese motherboard, which is why I got this error. How do I put the Chinese ROM on a blocked cell phone?

 

[elhardi]

I want to unlock the bootloader of the Mi 11 Ultra, its motherboard was changed. I tried the official way, which is through Mi Unlock and I couldn't, it says that the cell phone is not registered on the server or something like that, any ideas?

edit: I did some research and saw that I have the global ROM on a Chinese motherboard, which is why I got this error. How do I put the Chinese ROM on a blocked cell phone?

Did you find any solution?

 

[rogermk]

I want to unlock the bootloader of the Mi 11 Ultra, its motherboard was changed. I tried the official way, which is through Mi Unlock and I couldn't, it says that the cell phone is not registered on the server or something like that, any ideas?
...

I Have a 11 Ultra as well,

I advise you NOT to install the Chinese ROM, as you will not be able to unlock the bootloader if you do not have a Xiaomi account activated in China.
Youll GET

"The place where the account is registered does not match the place where the phone is sold"​

Please can u say what is the exactly firmware do u have installed today? And the Serial number of your Phone?