Sziasztok!

Akinek nem működik az unlock, az törölje a régi fiókját, csináljon újat és minden menni fog elsőre.

I've deleted my account and registered new. It worked fine with the new account.
https://account.xiaomi.com/pass/del

follow this link and your Mi account will delete permanently.

1. Go to https://account.xiaomi.com/pass/del and sign in.
2. The Delete account will pop-up right after the login.
3. Send the verification email.
4. Copy and paste the verification code you've received.
5. Confirm that you want to close the account.