I'm in china and want to use my china sim on my xiaomi m2,but it says "your device is locked, please insert sim card or login with xiaomi account" I was also here in may, and was able to switch sims with no problem so what changed? And how do I unlock the device? Unfortunately, im unable to login with my xiaomi account as when i put my password, it says "checking" and gets stuck there and nothing happens. (perhaps because theres no wifi here?) Please help! I need the sim urgently. How do I get the phone to accept it?!