First video on youtube to solve the error.!
Procedure for unloacking and solving error :-
Step 1 Download the mi bootloader unlock app in pc or laptop
Step 2 open the app and fill the I'd information and install drivers .
Step 3 Start the unlocking process and when it starts at 0% remove your mi phone
Step 4 wait untill it reaches to 99% and when it reached to 99% immediately plug in phone
Step 5 Now your bootloader should be unlocked
Note :- you device should be in fastboot mode
Requirements::-- A pc or laptop
An internet connection
Usb cable
A brain
*******You don't need to take permission or waiting**********
######THANX FOR WATCHING AND PLEASE SUBSCRIBE IF IT WORKS ########