It’s a pretty old device (released in 2005), but I find the challenge interesting. It has already been jailbroken, but the current exploit uses a malformed AVI file to execute arbitrary code. My goal is to replace the firmware with a bootloader, in order to allow to choose between MediOS and the original Archos firmware.
So I dumped the ROM, descrambled the firmware (the descrambling code can be found in MediOS). Let’s get to work now.