Help wanted for interesting hack job

[the_ape]

I'm trying to hack my in car satnav, it runs CE and I'm able to decompile one of the binary images and see some of the applications that the device runs, however I am trying to decompile the OS binary and the same decompile process will not work.

Anyone got any thoughts on what to try?

Oh it's an SH4 device btw and the ROM etc is loaded from DVD.

Thanks in advance for any help.

Cheers

[the_ape]

Quick one,

E:\>ImgfsToDump.exe 07AVNe.bin
ImgfsToDump 2.0 RC 3
guidBootSignature: 42 30 30 30 46 46 A 0 0 6 80 FC C2 4F 0 0
dwFSVersion: 10800600
dwSectorsPerHeaderBlock: 99000000
dwRunsPerFileHeader: 09000002
dwBytesPerHeader: 01000900
dwChunksPerSector: 2B0009D0
dwFirstHeaderBlockOffset: 58000940
dwDataBlockSize: 40880356
szCompressionType:
dwFreeSectorCount: 97000000
dwHiddenSectorCount: 45000002
dwUpdateModeFlag: DC434543
Compression DLL does not support compression type ''!

Anyone that can point me in the right direction would be appreciated