Thread: Lock a img-file

Originally Posted by catymag

May be do you get the unauthenticated map message?

What do you mean here??

Originally Posted by catymag

use Fast IMG Unlocker instead of .unl, look for it in Garmin software section (sticky thread)

I've already used Fast IMG unlocker to open the map, and it works. But I want to lock/secure the map.
I've copied the original map (GMAPSUPP.img) to a memorycard, and created a GMAPSUPP.UNL with a code generated from Jetmouse. But when I boot up the GPS, I get this error: "The map can not be verified"

Maybe Jetmouse can't generate codes for this new map? MapID is 4548. It's a Topo Premium map for Norway

Originally Posted by SpritHansi

What do you mean here??

I've already used Fast IMG unlocker to open the map, and it works. But I want to lock/secure the map.
I've copied the original map (GMAPSUPP.img) to a memorycard, and created a GMAPSUPP.UNL with a code generated from Jetmouse. But when I boot up the GPS, I get this error: "The map can not be verified"

Maybe Jetmouse can't generate codes for this new map? MapID is 4548. It's a Topo Premium map for Norway

Garmin implemented a second verification stage in early 2010. The reason was to protect their new maps from unlock codes generated by KGs. The implementation considers all Garmin maps with MapID/FID >=2200 as "new" maps that needs GMA digital certificate authentication.
Newer units gets GMA aware firmware and some of the older gets FW updates to implement the GMA technology. The consequence is that you need a unlock code for unlocking maps and you also need a GMA-file for authenticating locked maps with MapID/FID >=2200. In this case, step 1 = unlock with code and step 2 = authentication with GMA.
Many 3rd part map creators using cGPSmapper had to alter their map series since they used the upper range of MapIDs. Maps from providers like OnRoute stopped to work in 2010 and as a result they recomplied the maps to new MapIDs < 2200.

For Garmin systems that's GMA protected:
The only possible way to have the locked map with MapID 4548 to be unlocked only by 25-character code would be to alter the MapID to a value below 2200. Otherwise you have to use unlock removal as with Fast IMG Unlocker.
Guessing it's "Topo Premium - 3 Oslo" we are dealing with here?

Code:

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