Quote Originally Posted by SanFrancisco View Post
........ rolling back FW and then reinstalling the new FW again does more "deep cleaning" than reverting back to factory settings.

I therefore flashed FW version nuvi2x5W_GCDFile-MTK__760.gcd into the device via WebUpdater. After reboot however the same 1 hour lag still shows.
I then let WebUpdater load the latest FW version nuvi2x5W_GCDFile-MTK__780.gcd
As you'd know the first nuvi to have the ability to clear nonvol via the hidden menu behind the speedo was the 1xxx series. In earlier devices like the 2x5 series it is possible to perform a similar function by downgrading fw but it usually needs to be done by several versions. There can be a risk of white screen bricking if the device has a late series of PCB that wasn't issued at the time of issue of the old fw and a white screen may result in a genuine brick, as in paper weight. The safest option might be to simply open it up and disconnect the battery for some time then hard reset it again on subsequent start up. Might work but if not go with your idea about daylight saving. Good luck!