So I just acquired this unit, and after installing an update I realized I updated to 4.0EU! I live in the US, is there anyway I can revert back to a US firmware? If so how? because I'm new to this! Problems I am having 1- After system check the unit will restart 2 no maps (I deleted the files because I watched a youtube video saying this would fix the bootloop) PLEASE HELP!!!!! THANK YOU!