I used the file you have sent to user "Mork" on 2022-11-18 11:39 for a similar problem. With the SD-card in place and bridging F5, I got the reaction as shown above on my screen shot. If I try to boot normally without the SD-card inside then the screen doesn't show anything but backlight of the display is on.
I assume with the right recovery files, the machine would come back to normal operation.
Thank you.
Dear Sir,
Thank you very much for the fast reply.
In my case, I would need the recovery files for the internal 4GB SD card. My oscilloscope does not respond anymore on booting using the USB stick.