SanDisk Sansa Clip+ Recovery nand

[rockboy]

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.

So, did ou manage to recover nand?

[vitt13]

So, did ou manage to recover nand?

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]

So, did ou manage to recover nand?

Unfortunately no.
I even bought a cheap clone JLink V8 https://www.aliexpress.us/item/2255799995995456.html but have no inspiration to try out.

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.

if I jump to 0x0 and start executing from there, it runs, then gets stuck in a endless loop somewehre in 0x80004xxx or somesh*

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.

[rockboy]

I was able to get full access to the unresponsive NVRAM by heating the chip to about 250 degrees. But how to organize the resuscitation of Clip+ I have no idea!