Your kind answer helps me tremendously, Butters, and I thank you very much.

Indeed, my intention is to modify the firmware. I had achieved this a year or 2 ago on my 64s and was able to load maps so I’m interested to try the same thing on the DriveSmart 50 LMT-D 5.

I’m not there yet: I’ve been reading this forum for about 2 days and still can’t understand how to reliably produce and patch a suitable RGN file:

• I did find the original firmware file DriveandDriveSmart40_50_590.gcd (thanks to [Only registered and activated users can see links. ]).
• I understood I’d need the HWID number however none of the methods [Only registered and activated users can see links. ] appeared to work on my unit.
• I found the tools I probably need (RGN_Tool.exe and Updater.exe) but ignore how to perform the patch I need.

I’m clearly not the smartest member of this forum…

Any further advice would be most welcome and appreciated.