Prophet Upgrade Ship
1. Download the NVID(no vendor) AKU2.2 rom for WM5 here (LINK BROKEN) YOU CAN USE Step1 of PdaMobiz or PDAViet Temp INSTEAD OF NVID(no vendor) AKU2.2 ROM, or any ROM from here: http://wiki.xda-developers.com/index.php?pagename=Prophet_ROMs
2. After it has been downloaded get the latest Active Sync from Microsoft.com
3. Install ActiveSync, you might need to reboot
4. When your computer has rebooted, run the file from step No 1 . Follow the steps, remember that it can take some time and seem to stuck at 80% and higher, but just wait.
Hard reset your device after this, and you're done!