Unlock Bootloader

Method 1

Step 1
Download the Mi Unlock app miflash_unlock-en-2.3.803.10.zip

Step 2
If your device is locked, please click here to unlock it first.

Step 3
Open the Mi Unlock app, then connect your phone to PC/Laptop via a USB Type-C cable after entering fastboot mode.

Step 4
After the phone being identified by the unlocking tool, proceed the unlocking process.

Method 2

Apart from the above method, Mi A1 can be unlocked through command line.
Please connect your phone with PC/Laptop via a USB Type-C cable after entering fastboot mode,then type this at a command prompt: 

fastboot oem unlock 

Your phone will be unlocked.


Source

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