I read that allot of people are having the same problem of the f90 rebooting itself. Everyone says I need to enter into testmode and delete files. Can anyone help me with the download of testmode files that I can download to a SD card?

Here you have testmode file:
http://avic411.com/index.php?/topic/35110-avic-f40bt-testmode-fixed-firmware/?p=256194
Just copy this one to a SD card.

thank you