I got a AVIC-F900BT, it is not not longer picking up GPS signal(go into setting page for GPS navi, a Red 'N 'is showing and no strength showing up. , have not said that i have been using for 1 year with no problem and did not remove the deck or any hardware.

GPS not working since i connect the unit with my iphone 4 for a few days and the whole unit just keep re-booting(can not get into menu pageï¼ï¼‰but after a few days, it can into menu page but GPS is not working.

Any one knows what happen??

have you made sure that you have the most current software, you may have corrupted files,

I downloaded the firmware 2.0060 from pioneer, Do you think this is the way to solve the problem? (By inserting SD card to install )?

its definitely a good place to start.