Nuvi 58LMT "can't unlock maps".

**stevex** · 16th July 2025, 03:52 AM

OK I wiped it and created an empty Garmin folder. It did reboot OK. I cleared nonvol and got prompted for language settings when device restarted.

I then reconnected GE and reinstalled maps. No errors reported.

Device restarts and the same errors and behaviour as before

That is says no detail maps then cannot authenticate. Foursquare data visible but no maps as the old low detail map hasn't been copied back.

I'm wondering if the Garmin server is sending back an unlock file that for some reason wont work with my device.

**Garman_Nuvi** · 16th July 2025, 04:36 AM

I did check your garmindevice.xml and the are nothing that stands out.
The garmindevice.xml show the UK & ROI installed as the gmapprom.img
You might be onto something with the unlock codes ,I'm just running some tests at the moment...........

OK, it appears the .unl codes Garmin Express is creating for UK & ROI do not have the correct product number of the map,and the Foursquare .img has the correct one.

Spoiler: Image