The Rockbox Sansa e200R/Rhapsody Port

Install

Here follows a summary of the facts and knowledge we have gathered so far about the R models and how they differ from the vanilla e200 models:

Bootloader

• The R model bootloader loads the mi4 and actually verifies that the 160 bit digital signature is fine before proceeding. Thus upgrading to a custom firmware is next to impossible without replacing the bootloader.
• The bootloader itself does not allow the bootloader to be replaced (using recovery mode).
• The bootloader is stored in the same place as in the vanilla e200 model, and is the same size.

Firmware

• The mi4 image is somewhat differently encoded and encrypted than the vanilla e200 mi4, but we have figured that out already. Users have managed to run the R model firmware on a vanilla e200 (given some manual adjusting).

e200tool

• We managed to extract the bootloader code/image from the R models using e200tool in manufacture mode, simply due to the fact that it has a copy of the bootloader in RAM at the time, at the same place in memory as the vanilla models have.
• We can load custom code to the player with e200tool and run it, so we could extract further info and do testing that way.