Rockbox Development > New Ports
Sandisk Sansa e200R
Wyldfire:
SNIP/
No. Go back and read up on what the "plaintext trick" is. It has nothing to do with DRM.
/SNIP
OK... Ive searched the forums... where is the info on the "plaintext trick"? I can't seem to find it anywhere.
Bagder:
--- Quote ---Ive searched the forums... where is the info on the "plaintext trick"? I can't seem to find it anywhere.
--- End quote ---
See http://daniel.haxx.se/sansa/mi4.html check the description of the mi4 header at index 0x18
xhozt:
--- Quote from: Bagder on April 23, 2007, 05:23:20 PM ---
--- Quote ---Ive searched the forums... where is the info on the "plaintext trick"? I can't seem to find it anywhere.
--- End quote ---
See http://daniel.haxx.se/sansa/mi4.html check the description of the mi4 header at index 0x18
--- End quote ---
Ok after taking a break to clear my mind on working on this . I started over with this in mind
{0x18 32bit length of the plaintext part. The YH-920 mi4 file has zero there. Every other file has it 0x200. Most bootloaders seems to be OK with this value being the entire file's size and thus effectively removing encryption.}}
now i am thinking i see were the diffrences in the R may make this tricky {this is per a email chat i am having with a person over at real about the player he wants rockbox on the R also . } what we are thinking will need to be done is to try and find a way to trick the player into thinking its a regular e2XX , then it will take the plaintext trick . but as has been said before without help from some one with a R with more experance than me in coding this is gonna take a good long time ..
Bagder:
--- Quote from: xhozt on May 08, 2007, 05:25:48 AM ---now i am thinking i see were the diffrences in the R may make this tricky {this is per a email chat i am having with a person over at real about the player he wants rockbox on the R also . } what we are thinking will need to be done is to try and find a way to trick the player into thinking its a regular e2XX , then it will take the plaintext trick . but as has been said before without help from some one with a R with more experance than me in coding this is gonna take a good long time ..
--- End quote ---
To "trick" an R model to become a vanilla model you need to flash a vanilla bootloader to it, and since the R models don't allow upgrading the bootloader you would need to use the e200tool approach or similar to attempt to do it.
Once we can put a custom bootloader there, we can put the regular R model bootloader there but with the key signing check patched out (we have such a binary lying around) and we should be able to boot Rockbox.
So again, this is all known facts to us. The problem we're facing is how to put a new bootloader on the R models.
killermusic900:
i'm about to get my sansa returned, so i was just screwing around with it, and if you format the 16mb drive in recovery mode, it says LUN0 unlocked. does that mean anything?
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