Thread: Nuvi 58LMT "can't unlock maps".

All is not lost.
If you use your SD card as a clone of your device you should be able to download all the update files.
Make a copy of your garmindevice.xml from your device ,create a folder on the SD card called Garmin and paste it into it.
Disconnect your device from your PC and plug in the SD card.
Use Garmin Express to update the SD card clone and you should end up with a .system folder with the update.
You can then copy/replace the files in the system folder on your device from the SD card

Code:

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Spoiler: .system image

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From you file list below it looks like the UK & ROI map update happened and the FW was also updated ,most properly a corruption occurred of the gmapprom.img,gmapprom.unl or gmapprom.gma

What you are seeing/describing is the base map gmapbmap.img without any detailed map.