I have a avic 930bt and was wondering if worth updating the firmware and bluetooth to 940bt firmware.Theres this guy on ebay selling them for 30 bucks.He said you can only use this once meaning that if you got two units then you need two cards something to do with each update you do has to have a password.
Any ideas or suggestions . Seems like a good update but wondering if worth doing . Are the maps better and if the unit is bypassed would the update screw that up or wont be effected.
Thanks