Little Talk about Redmi Note 5 Unlocking Bootloader

THIS IS ASSUMPTION. IT NEED TO BE APPROVED ==========================================

I Can be unlocked Officially or unofficially: 
  - Builtin-Official CPU and eMCP 
  - RPMB is provisoned   

II Can be unlocked unofficially
  - Builtin CPU and eMCP was repartitioned
  - RPMB is still provisoned 

III Can't be unofficially nor even officially unlocked: 
  - eMCP or CPU was Changed
  - RPMB isn't provisioned or failed.