Show Posts
1
Reverse Engineering / Re: Reverse engineering Arm (Korg) firmware
« on: October 12, 2014, 08:21:48 pm »
That thread on korgforums was started by me.
Binwalk and onlinedisassembler both comeup empty handed.
The firmware appears to contain "nth byte" obfustication... I.e in a hex editor you'll see the word "KOR.G"... or "progr.am" I dont know for a fact that the cpu is arm based, its an assumption given that the predecessor (the M50 which has a nearly identical GUI and features) is ARM based.
But.. running the hex into Arm diassemblers rapdily starts reporting invalid instructions.... so the file format definately has some sort of structure or encoding to it (I.e. not vanilla executable). The tail of the file contains many similar repeated blocks... which I'm assuming are either the bitmaps used to represrnt instruments, or (perhaps more likely) the DSP code that gets downloaded into the korg edsx engine.
The avtual firmware can be downloaded at http://i.korg.com/uploads/Download/USA_KROME_V103_E1.zip.
Binwalk and onlinedisassembler both comeup empty handed.
The firmware appears to contain "nth byte" obfustication... I.e in a hex editor you'll see the word "KOR.G"... or "progr.am" I dont know for a fact that the cpu is arm based, its an assumption given that the predecessor (the M50 which has a nearly identical GUI and features) is ARM based.
But.. running the hex into Arm diassemblers rapdily starts reporting invalid instructions.... so the file format definately has some sort of structure or encoding to it (I.e. not vanilla executable). The tail of the file contains many similar repeated blocks... which I'm assuming are either the bitmaps used to represrnt instruments, or (perhaps more likely) the DSP code that gets downloaded into the korg edsx engine.
The avtual firmware can be downloaded at http://i.korg.com/uploads/Download/USA_KROME_V103_E1.zip.