Thread: Incorrect time on nüvi 255W

Originally Posted by SanFrancisco

........ 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!

Originally Posted by Magnetron

Just correct the UTC by 1 hr to get your local time right.

....so if the speedometer in your car shows an incorrect speed, you simply turn the dial plate to correct it, rather than fix the cause?

Apart from the fact UTC is showing correct on this device, UTC is an official world-wide atomic clock time standard. National laboratories around the world have atomic clocks synchronised to this atomic time standard. It has an accuracy of less than a micro second, and you suggest I change it by no less than an hour??? How on earth would I ever pull off such a trick?

Originally Posted by Butters

...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...

I'm most willing to accept confrontation with a WSOD (white screen of death). The educational aspect of the exercise outweighs the risk of bricking the device. However, version 7.60 and 7.80 are the only FW flavours I have for this particular HWID. The only additional version available at "Perry" is 7.70, but that is even more recent than the 7.60 version which I already tried.

Will try to backup rgn.41, then erase it and see if that brings back the correct local time. If not, I will see if formatting the internal memory using RMPrepUSB helps and then start with a clean slate. I can always restore the backed up rgn.41.

To be continued...