1. Unlock the bootloader Ask for the unlock in http://www.miui.com/unlock/ Download and launch mi unlocker with your mi account Put you phone into fastboot mode (volum down + power when shut down) Follow the instructions Now your phone must be unlocked 2. Custom Recovery Download the recovery for Mi4S : mega:#!KFMV3b7R!JimCtnMwheL2mMQyQymtmFQBljirMcR01BGL5E7iInU Download adb : http://forum.xda-developers.com/showthread.php?p=48915118 and install it Put your phone in fastboot mode if not already and connect it to Pc Go, in your computer, to C:\ADB cut/paste the recovery_aqua.img in the folder C:\ADB Shift + right clic and "open a command window" Type "fastboot devices" and press Enter just to be sure your device is correctly recognized. Type "fastboot flash recovery recovery_aqua.img" and press Enter to flash the recovery Now you're recovery must be the TWRP. You can now install the rom (*.zip) from it.