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Prereqs
1. Download zip files & extract
2. Place adb drivers & mi unlock tool in c:/ directory
3. Place all files onto sd card since you are going to wipe your phone if not just download files onto phone twice

Unlocking Bootloader!
*backup your data, it wipes it all off!!!*
1. Go to settings, about phone, tap MIUI version several times until device says you are now a developer
2. Go back to settings, mi account, sign in. *YOU MUST REGISTER YOUR PHONE NUMBER AND EMAIL OR IT WON'T WORK*
3. Go to settings, additional settings, developer options, enable OEM unlocking and usb debugging, then click on Mi Unlock status.
4. Agree to you info being shared, and click on add account. You will need to disable wifi as it only lets you link with data.
5. Extract mi unlock tool via downloaded zip or go to unlock.update.miui.com Zip file is version 3.3.525.23 since the current
zip from the site didn't work. If you are having trouble, unlock.update.miui.com has a FAQ that can help you.
6. Run the MI Unlock application, but make sure you right click and open as administrator.
7. Agree, log in with the same account as you linked on your phone.
8. Hold power and volume down button on the phone until you see fastboot on screen. Plug in the phone and wait to see your phone register on the computer. If it won't register, go to device manager and right click device, and click on update drivers. Or, before
putting phone into fastboot mode, plug into computer for the computer to find drivers.
9. Click unlock on screen several times, and watch the device unlock. If the program says to wait 24,360,1000 hours,
wait that amount of time, and redo steps. To get out of fastboot mode, hold power until it reboots.
10. After software says device is unlocked, reboot and reset up information. Your bootloader is now unlocked.
11. After setup, do steps 1-3 again.