Take alook at this
http://www.4winmobile.com/forums/win...uu-errors.html
ERROR [262] : UPDATE ERROR
"This error occurs during the CE ROM code upgrade process.
Solution: If this happens, you can just soft-reset the device and run RUU again. The update process will then continue.
Note: At this stage, the Wince is destroyed; instead, it is in upgrade mode"
exactly what is said inside that link.