I have never had a problem to reinstall a map with Garmin Express if I needed to do that.
Spoiler: Reinstalling a map again with Garmin Express
It has always had the function to reinstall maps to the Garmin Unit.
You can even install to the PC and work with it with Garmin MapSource or Basecamp
Even if you say the map is corrupted reinstall it again.
You can even copy the map that is corrupted to you PC.
Spoiler: complete manual
Spoiler: Garmin Support for the Garmin fleet™ 670
Spoiler: USB communication issues can prevent your Garmin device from being detected by Garmin Express.
Spoiler: There is also fleet updater too have a look.
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