I upgraded to 3.61 during breakfast and after the reboot my Oregon550 got stuck at the screen where the Garmin logo is displayed. Then I found this thread and read Dr Jeckyl and Mr Hide's post about the need for satellites during an unusual phase of the boot process. So I put my O550 outside, nothing changed for 5 Minutes. I rebooted outside, got a sat fix, the unit started as normal and I verified that 3.61 was running. Then I took the unit back inside the house where I lost sat reception again. This caused the unit to freeze. Now I'm back at 3.52 and lost all user data during the downgrade process. Thank you, Garmin, for offering such a bad beta for download.