How to Unlock the Mi Bootloader
Unlocking Bootloader Procedure:
1. Download zip file (recovery file) of China developer ROM for your device, put it into phone storage (If you're using Redmi Note 3 Qualcomm version or Mi 5, you can unlock on MIUI Global Stable ROM,click here to download). Go to Updater app, press the three dot on upper right corner, and select 'Choose update package'. Choose the zip file you just put in phone storage. The update will wipe all user data, please make backup beforehand.
2. Log into the Mi account which has acquired unlocking permission on your device
3. Turn off your device, press the Power button and Volume - button at the same time to enter bootloader mode
4. Log into the unlocking tool on PC with the same Mi account. Connect the device with the PC using USB cable
5. Press 'Unlock'. The unlocking process will complete in about 10 seconds
After unlocking bootloader, users will be able to flash fastboot ROMs and custom ROMs. The unlocked device will be marked in the official service end. Users could lock bootloader again by flashing official MIUI ROMs. (This will need to use fastboot oem lock. Please note to flash offcial MIUI ROMs, otherwise your system won't be able to start)
Notes:
1. After getting unlocking permission for a Mi account, users can unlock the verified device immediately. One Mi account could only unlock one device within 30 days
2. Users could require for unlocking permission in this site: http://en.miui.com/unlock/
3. If a prompt says that the current account is not logged into a connected device. Please log in with this account on the device that needs to be unlocked
4. If your device is encrypted, unlocking bootloader will wipe all user data. Please perform a backup beforehand5. If your application has been rejected, please try to apply again later. And please input the real reason that you want to unlock your device in Chinese or English. Don't copy and paste others' unlocking reasons.
Unlocking Tool Download:
MiFlashUnlock_1.1.0317.1_en.zip
source
1. Download zip file (recovery file) of China developer ROM for your device, put it into phone storage (If you're using Redmi Note 3 Qualcomm version or Mi 5, you can unlock on MIUI Global Stable ROM,click here to download). Go to Updater app, press the three dot on upper right corner, and select 'Choose update package'. Choose the zip file you just put in phone storage. The update will wipe all user data, please make backup beforehand.
2. Log into the Mi account which has acquired unlocking permission on your device
3. Turn off your device, press the Power button and Volume - button at the same time to enter bootloader mode
4. Log into the unlocking tool on PC with the same Mi account. Connect the device with the PC using USB cable
5. Press 'Unlock'. The unlocking process will complete in about 10 seconds
After unlocking bootloader, users will be able to flash fastboot ROMs and custom ROMs. The unlocked device will be marked in the official service end. Users could lock bootloader again by flashing official MIUI ROMs. (This will need to use fastboot oem lock. Please note to flash offcial MIUI ROMs, otherwise your system won't be able to start)
Notes:
1. After getting unlocking permission for a Mi account, users can unlock the verified device immediately. One Mi account could only unlock one device within 30 days
2. Users could require for unlocking permission in this site: http://en.miui.com/unlock/
3. If a prompt says that the current account is not logged into a connected device. Please log in with this account on the device that needs to be unlocked
4. If your device is encrypted, unlocking bootloader will wipe all user data. Please perform a backup beforehand5. If your application has been rejected, please try to apply again later. And please input the real reason that you want to unlock your device in Chinese or English. Don't copy and paste others' unlocking reasons.
Unlocking Tool Download:
MiFlashUnlock_1.1.0317.1_en.zip 
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