User blog comment:Fredy-san/My Phone Broke/@comment-25436749-20170122043513/@comment-24659969-20170122070548

It is not about unpopular, but more about since Xiaomi series requires a specific bootloader unlocking. This bootloader unlocking can not be bypassed due to the nature of its stock rom (MIUI) and base Android 6.0+. The bootload unlocking also requires you to create an account in Mi website to obtain the unlock key specific to your phone IMEI (device ID) numbers so you have to do that manually. No app can do that for you due to security and mischief reasons.

You can try the generic rooting methods for this kind of phones: Unlock bootloader, install a recovery.img like TWRP or CWM then install the supersu.zip which unlocks the root admin privilege or flash custom rom with root integrated.