Shuffle2 completed the PSFreedom style implementation of the JigAuth code (Downgrade Dongle) in rockbox yesterday. I've been down with a cold and completely out of it... I know that's real inconvienient but trust me it was inconvienient for me as well. ;-)
At any rate, shuffle2's github is updated follow the normal compile procedure but uncomment the new JIG_AUTH define to make a jig Auth Dongle in firmware/usbstack/config.h, like so:
#define JIG_AUTH
An interesting point is that the Jig seems to be Firmware independent!!! I compiled my c200v1 version for FW 3.41 accidentally and it still worked. So there isn't a need to compile for every firmware target on the face of the earth. The sansa c200v1 is confirmed working by me, the e200 is the same exact code just cross compiled for the e200 should work as well.
Below are the Sansa ones I've compiled.
USE AT YOUR OWN RISK. Know what your doing first, Know how to get it back out of service mode BEFORE you start, and know that if you do downgrade you might break BluRay compatibility among other unknowns.
Update: this files now include the < 3.41 fix shuffle2 did. Should work with 3.42 and 3.50 now.
Last edited by CrashSerious; 12-11-2010 at 12:29 AM.