Ok im way late but I need assistance something serious I have the 700bt system settings are grayed out but I would like to upgrade to the latest firmware do I need to go from 2 to 3 to 4 or can I go from 2 to 4 and where can I download also can I use a galaxy note 9 to write the files on an SD via an SD reader. Email is jculb1988@gmail.com please help