Thread: if i update nuvi 3590 to version 8.30 by garmin wepudater ??

Originally Posted by Butters

There is no GSV protection in 35xx firmware so the firmware doesn't require patching. There is Map Signature Verification (MSV) protection in the firmware however so a map unlocker that doesn't overcome MSV in the required map won't work.

I should rather word it differently:
There is no MSV protection in 35xx firmware so the firmware doesn't require patching. There is GСD Signature Verification (GSV) protection in the firmware but it does not matter in this case, because the firmware doesn't require patching.
To unlock a map you enough to use the old gimgunlock-0.03 (without MapSigPatch) or one of its derivative.