Since the support for my phone ended and there's no way to use google wallet anymore using the xiaomi.eu ROM (which I really love) I decided to go back to the official ROM and lock the bootloader, I've seen many tutorials but I'm afraid of some problems that could destroy (totally brick) your phone, specially if you dont flash the phone's origial version of the ROM, for example China or Global.So my question is: Is there a tutorial on how to go back to the original phone's ROM?