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jeremyb



Joined: 09 Dec 2008
Posts: 1711
Location: RecoverMyFlashDrive.com Bridgeport, CT, USA

PostPosted: Thu Jun 11, 2020 17:21    Post subject: Notes: Chip 45 3e aa a2
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Just in case this helps someone else (or me in the future).

I'm not sure what these commands do, I don't plan on fully reverse engineering the sequence however the controller sends them to the NAND chip on startup. They don't appear to activate DDR on this chip but they do appear to modify some register(s). The entire sequence probably isn't needed.

By default reading the NAND chip will result in a very poor quality read.
SanDisk v1 RR might show a very slight improvement.
Reading with RB Ignore might show a slight improvement.

Initially the chip will ID as ff ff ff ff or 98 4c 90 a3 76 51, sometimes it will ID as 45 3e aa a2 7e 51 after multiple ID requests (or after this sequence is sent).

My trick to reading it was using the following "After Reset" command sequence in addition to "Ignore Busy". I'm not sure if Ignore Busy was necessary but I used it for good luck, perfect read Smile

Cmd 0x5C 0xC5 0x55
Addr 0x00
Data 0x01
 
Cmd 0x55
Addr 0x20
Data 0xC8
 
Cmd 0xF1 0xFD
Cmd 0xF2 0xFD
Cmd 0xF3 0xFD
Cmd 0xF4 0xFD
Wait
 
Cmd 0xF5 0xFD
Cmd 0xF6 0xFD
Cmd 0xF7 0xFD
Cmd 0xF8 0xFD
Wait
 
Cmd 0xF1
 
Cmd 0xFF
Cmd 0x00
 
Cmd 0xF1
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Last added
KMSJS000KA-B308   ec d7 94 7e   1x1 SM3271Q-AC   45 de 94 93   1x1 Monolith MS_3   ec d7 88 bf   1x1 SM3281L-AB   2c a4 08 32   1x1 IS918M   2c 84 58 32   1x1 SM2703AA   ad de 94 eb   1x1 Monolith SD_34   98 3a a4 93   2x2 AU6998   89 a4 64 32   1x1 H26M64103EMR   ad de 14 a7   1x4 Monolith Micro SD_38   45 de a8 92   1x1
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