I hope thread is not so old. Who will help me to solve same situation as premmod's? I always get error system software missing, even after converting gcd ti rgn and successful update in pre-boot.
I tried to patch firmware and bricked it. :P So, someone please help me to revive a poor device? :P
Here are all stock informations about device:

Model: Garmin Drive 61
Hardware ID: V4 M4v3 P8 8GB CB S06 A6 RT BT
Device ID: [Removed]
Software version: 6.00

PartNumber>006-B2587-00</PartNumber> (took from original device xml file), so HWID is 2587

Thanks in advance