Hello Mi Fans!Today im gonna show you how you can solve the bound error when trying to unlock the bootloader of Mi phones using Mi Flash Unlock Tool.
This error occurs when the unlock process is stuck @ 99%.When you try to bind device in developer options it shows an error86012: device does not exist (in Chinese).
So here are the steps to solve this issue:-
1.Go toi.mi.comand go to my devices.delete all other devices except the device which you are trying to unlock
2.Next download the Mi Flash Unlock Tool version 1.1.1from http://en.miui.com/thread-536201-1-1.html&rct=j&sa=U&ved=0ahUKEwjFr5DHtZrUAhUMKY8KHY8xAEEQFggcMAA&sig2=YPxRi2qr3Am5C6lAb2pM0g&q=mi+flash+unlock+version1.&usg=AFQjCNEvSL9pB-KI-e8LkWlRR0_xkfYXFA" target="_blank">here because the latest version has this bind issue whatever you try.
3.Now Unzip the contents
4.Open MiFlashUnlock.exe(maybe a different name)
5.Now login to your Mi account that has the unlock permission
6.After that put your phone in fastboot mode.
7.Then click unlock!
8.Just sit back and relax!
9.VoilaYour phone is unlocked!
IF ANY PROBLEM OCCURS PLEASE COMMENT BELOW!
This is experimental and its not guranteed to work for all devices/users, so follow at your own will.
If it works then good otherwise follow the official way