Thread: Honda Goldwing 2006-2008 Navi GPS Firmware Update Versions 4.60 & 4.70

Originally Posted by pharmaweb

Some update, the actual sd in use is a 4 gb hc with the same sys.bin file, only the gmapsupp.img and gmapprom.unl are updated.

If you have sys.bin file exposed then this is probably the main firmware. You can load it with IDA (Interactive Disassembler) and [Only registered and activated users can see links. ] and proceed with your dark intentions. So you don't need to pack/unpack GCD files at all.