Third Party > Repairing and Upgrading Rockbox Capable Players

SanDisk Sansa Clip+ Recovery nand

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rockboy:

--- Quote from: vitt13 on September 30, 2022, 02:20:21 PM ---I tried same JTAG connection with FT232RL under Linux and got similar output. Even with recompiled OpenOCD from sources.
And even with FX2LP board with firmware 'usbjtag-nanodla.hex' compiled from https://github.com/mithro/ixo-usb-jtag project.
I think my player is still alive at least it appeared as M200plus device and 32MB disk. So it definitely JTAG connection and OpenOCD issues.

--- End quote ---

So, did ou manage to recover nand?

vitt13:

--- Quote from: rockboy on August 28, 2023, 09:09:40 AM ---So, did ou manage to recover nand?
--- End quote ---
Unfortunately no.
I even bought a cheap clone JLink V8 https://www.aliexpress.us/item/2255799995995456.html but have no inspiration to try out.

rockboy:

--- Quote from: vitt13 on August 28, 2023, 02:29:26 PM ---
--- Quote from: rockboy on August 28, 2023, 09:09:40 AM ---So, did ou manage to recover nand?
--- End quote ---
Unfortunately no.
I even bought a cheap clone JLink V8 https://www.aliexpress.us/item/2255799995995456.html but have no inspiration to try out.

--- End quote ---
It seems, that the main issue is to find a dump from a similar nand.

vitt13:
Well I tried to restore the player again last weekend.
I passed all the steps from https://www.rockbox.org/wiki/SansaAMSJTAG.html (halt device, upload firmware, resume execution) but it was unsuccessful.
It looks I encountered almost the same failures that dongs https://www.rockbox.org/irc/log-20161231 overcame in the past.
The J-link clone works well, the CPU core ARM926EJ-S is detected.
Next he wrote about memory remapping.

--- Quote ---if I jump to 0x0 and start executing from there, it runs, then gets stuck in a endless loop somewehre in 0x80004xxx or somesh*
--- End quote ---
I guess my next step also has to be memory remap and load Rockbox bootloader.
And I again postponed further attempts, since my knowledge of debugging is very superficial. I'm still reading a voluminous topic from the archives.

rockboy:
    May be it would be possible for you to read "first bit info" from your original nand in order to start your clip+ with the help of this experience:
"My chip needed to be cooled to -28C while they were reading data from it. Reading was slow; super, super slow. It took 8 weeks to get the bits of the chip and to restructure the data. But they did it!"
https://teslamotorsclub.com/tmc/threads/successful-data-recovery-of-broken-emmc-chip-mcu1.182500/
Your chip may start to be readable from higher temperature.

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