Finally managed to unlock the bootloader on a recently bought Poco F6. Now you have to install an app asking the CCP to get a license to unlock your device on top of using the MI unlocker and wait 3 days!
No more Xiaomi phones for me. 
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Replies (3)
Do you update to Hyper OS 2 before to unlock?
Which is the app?
No need to update the phone before unlocking.
Read this tutorial on XDA forums for a detailed method on his to unlock Xiaomi Phones:
XDA Forums
โ๏ธHow to unlock bootloader on Xiaomi HyperOS(all devices,except CN).
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1st section
Just to check if you meet ...