Unlock Problem

Feb 13, 2017
hi all, i'm mi note pro user
its first time for me to install eu rom (7.2.9), now i get terrible drain battery problem, after that try to unlock bootloader but always rejected with

'Sorry, your application has been rejected.

The more active your Mi Account is, the more likely your application will get approved"

please advice what should i do for get out from this problem..thanks