No, devices from China region are gone completely locked forever I guess. Chinese government made a new law that makes Chinese manufacturers enforce locking any system modification.

For non-Chinese using recent OS (HyperOS) you need to apply for unlock and it has a global quota of 2000 devices per day. People need to time it exactly 00:00 Benjin time to send a request to server to MAYBE get permission for unlocking. Some people made scripts that send requests automatically and still very few people are able to unlock it. Most of the time you’ll get “quota limit reached”, and it’s only possible to try once a day.

I tried for 4 days and gave up.

Chinese government decision:

5. Manufacturers should improve the authority management mechanism for mobile smart terminals, improve the security of the operating system, and take technical and management measures to prevent the replacement of the operating system and the installation of application software in the product circulation link.

https://www.gov.cn/zhengce/zhengceku/2022-12/15/content_5732079.htm

This is the main thread about it: https://xdaforums.com/t/how-to-unlock-bootloader-on-xiaomi-hyperos-all-devices-except-cn.4654009/

The 7 days unlock process (which I did) is only valid for old OS versions like MIUI 14 (Not HyperOS). My second hand phone comes with MIUI 14 so it was simple to be done.