Hi there,
I have a AVIC-F900BT which was installed prior to the purchase of my car a few years ago. Everything to do with the Avic has been by-the-book according to Pioneer Australia (never had a prob, was running latest "au" version which was like 2.3 or something maybe? I can't remember, Pioneer are pretty lax with the AU support/releases), and never knew i could hack/mod/tweak or do anything with the deivce - frankly wasn't too fussed as I only used it as an entertainment device, not a GPS unit.
Anyway recently the reboot issue started (which i've discovered since stumbling on this