Quote Originally Posted by Neil View Post
First do a backup of both your files and region 41, and do a hard reset.
Quote Originally Posted by Neil View Post
Make sure you do the backups and reset as in Post #28 [that's essential!]. If unsure of anything, please ask.
Followed all the steps, did the backup but forgot the hard reset. Result was a bricked device (frozen on the Garmin splash screen). I unbricked it (coincidentally I picked up some unbricking experience over the weekend on a nüvi 1390, which came in handy here...) and am now back at having a nüvi 250W again with nüvi 255WT capabilities.

Before going through the process again (but this time including the reset): by hard reset, do you mean touching and holding the right lower corner of the screen while booting up?