As @li4m said, your emulator cannot be running when doing this update.If you were online while restarting the emulator that's probably why the home room didn't update for you.
Design users table > go to home_room > change default to 213
UPDATE users SET home_room = 213;
The first step might not be needed, I can't remember. Make sure your emulator is off before doing this and it should work.
UPDATE users SET home_room = 213;