Thanks to tycoonbob for the instructions and minifreezer for posting the necessary backup files!
I had the reboot issue mentioned above on my f90 and everything is working fine now.
For those having problems getting into testmode because your unit keeps rebooting before recognizing the SD card:
I pressed the RESET and eject buttind at the same time, then let go of the reset and keep holding eject for a few more seconds. You will notice that the led's start to "breathe". I guess that's some type of safemode reboot? Not really sure what it is or where I read to do it, but it works an