panel_firmware

Preqrequisites

ST Link, 4 spare pin headers, soldering iron and OpenOCD

Firmware restore (ST Link)

Edit the restore.sh script, and update the filename to whatever your backup is called and run it.

Locating the connector

There is a 4-pin connector on the board (JP3) - it has silkscreen that is labeled with GND, CLK, DIO, 3V3 pins.

Backing up the firmware yourself (ST Link + openocd)

run the backup_firmware.sh script

Backing up the firmware yourself (JLink Segger + openocd)

Reference: https://medium.com/techmaker/reverse-engineering-stm32-firmware-578d53e79b3

(Assuming linux)

This step is easier with an interactive session because the length of your flash may be different per board

Start the openocd session. For j-link (and clones)

sudo openocd -c "adapter driver jlink" -c "adapter speed 2000" -c "transport select swd" -f "target/stm32f3x.cfg" 

Connect to the openocd session in a new terminal window

telnet 127.0.0.1 4444

In that prompt try running these commands to connect to halt+reset it

init 
reset init

List flash banks available on the board - there should be one (size 0x00010000) (64k)

flash banks 

Read the firmware and save it to firmware_panel.bin, use the size you got from the previous step

flash read bank 0 firmware_panel.bin 0 0x00010000

Exit the session

exit

Now you should have a firmware_panel.bin file in the CWD you ran the openocd daemon