Thread: Garmin GMA protection and the "Unauthenticated" status

Originally Posted by Vertego

Having read all of the above posts, I cannot see that my situation has been explained.

I don't understand how the maps can be unlocked AND unauthenticated. Any clues?

Thanks

Sorry,no you havent read with care or you should have understood why, maps with FID greater than 2200 are unauthenticated in your device , use unlockers as explained. Read it again.

You can unlock in your etrex maps with FID smaller than 2200 with the .unl file, but all the maps from Garmin since almost 2 years have FID greater than 2200.

Originally Posted by gulldong

And no way to create a gma file... Thanks again

No. Just Garmin can build .gma files, till now nobody could decrypt these files ,even because ,as Roger wrote above, we can cope with it

In fact, we can decrypt GMA files. Firmware does it, so we can do it also. The problem is, we can't forge them, because they are signed with 2048-bit RSA and we don't know the private key.
But here is the public key below. Maybe someone clever can break it

Code:

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UPD:
Btw, here is the public key, which is used for GCD signing (2048-bit RSA also).

Code:

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@ kunix

Kunix, can you make it in binary? Maybe it would be easier to figure something out.

And at the end what are we searching for? Do we know a result? Do we know is it bounded to the nuvi ID or other nuvi number? Surely is connected to the FID of the map.

@ roger

If you are a map developer you can make money from that. Not paying to garmin. But in general it is stupid. Just like making a software for iOS and not paying to Apple. For example.