Rewriting corrupted firmware on Digitech JamMan Solo

ID: 195105

Description: This tutorial shows how to connect to the...

Steps:

  1. Before starting, plug your pedal to a computer using an USB mini B cable.
  2. If your device is detected (for instance in Peripheral Manager for Windows users, with "lsusb" for Linux users)
  3. Install the JamManager software from here
  4. Try updating the firmware using JamManager
  5. If your device is not detected, or if the firmware update fails, carry on with this tutorial
  6. The following procedure is risky and may render your device more definitely bricked than it already was.
    7. Step image
  7. Unscrew the 4 Torx T15H holding the bottom plate
  8. Free the bottom plate
    9. Step image Step image
  9. Unscrew the 3 jack connectors bolts
  10. Lift the board from the top of the pedal
  11. Unscrew the 2 Torx T15H holding the SD card
  12. The board can be moved out of the pedal
  13. There is no need to unmount it further to access the debug port
  14. Connectors to the display and button boards and to the SD card slot are soldered, do not try to disconnect them
    15. Step image Step image Step image
  15. Spot the debug UART port
  16. Under the button when looking from the top
  17. Marked as "P3" when looking from the bottom
  18. UART connection requires to connect TXD, RXD and GND
    19. Step image Step image Step image
  19. Solder a 3V3 USB-UART adapter to the pins by following this pinout
  20. GND connected to the adapter GND
  21. TX connected to the adapter RX
  22. RX connected to the adapter TX
  23. You can also solder an intermediate 2.54mm DuPont-style header connector and use DuPont debug cables
  24. No need to connect 3V3, RTS and CTS
    25. Step image Step image
  25. Connect to the USB-UART adapter using an appropriate software
  26. PuTTy on Windows machines
  27. Screen or Minicom on Linux machines
  28. The serial parameters are: 115200, 2N1, no flow control
  29. Once everything is connected, you can plug the 9V power supply to the pedal
  30. It should display startup messages
  31. Afterwards, it should give you a prompt with the possibility to interact with it
  32. Try typing "ls"
  33. If possible, ask a friend to do the same with a working pedal
  34. On the working pedal, with the USB-UART probe and with an SD Card inserted, type:
  35. etfsctl -d /dev/etfs2 -r /mnt/sdfs/etfs2.structured.bin
  36. cp -r /mnt/nandfs/* /mnt/sdfs/nandfs_copy
  37. Otherwise, recover the files from the Internet
  38. My copy of a working JamManSolo firmware
  39. Copy them from your computer to the SD card
  40. Make sure you have the exact same model, JamMan Solo, do not use for the JamMan Solo HD or any other product!
  41. Insert the SD card with the working files in the device and run:
  42. etfsctl -d /dev/etfs2 -S -e -w /mnt/sdfs/etfs2.structured.bin -c
  43. Once it is done, power cycle the device and checks if it works
  44. If it is still missing files, run:
  45. cp -r /mnt/sdfs/nandfs_copy/* /mnt/nandfs
  46. Power cycle and verifies the device is working
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