Hi all. Midtrip I got the reboot loop on my f90bt. I scanned all the threads here (thanks Vegaslaptop) and found the answer but couldn't get my f90bt into testmode. Putting the SD card with testmode software in the unit and starting it up didn't work. Finally I got in. With the SD card in and my unit doing the constant reboot I held the eject button while pressing the reset button. Voila, testmode. Hope this helps.