Hi Microcheap,
Thank you for your reply! I contacted Hantek and indeed they sent me a (full?) firmware file (kernel.bin, uboot.bin, root.ubi, recover.ubi, params.bin, kernel_bk) with an uboot.exe tool to be copied on a SD card and make it bootable. This process requires windows xp (tool doesn't work on newer OS even not windows 7, I tried). That's why it took me some time to get the SD card set up properly. Then you need to put it in the SD card holder of the pcb. Bridging (shortening) two vias on the PCB causes the board to boot from the SD card and the NAND gets flashed from the SD content. The programming can be monitored on putty via the UART output. The tool gave me update success, then I removed the shortening bridge & SD card and did a reboot of the scope.
And then.....guess what 😷🤐😲💩
Nothing works anymore. Screen is blanked out, lights on the frontpanel are on, and no message / no control anymore via the serial interface. USB dead. And this although the script was running through without error.
I sent the log back to Hantek, let's see if they can help me further on this.
What I observed is that the tool obviously did not erase the NAND before programming, maybe it works only in production on a "fresh" NAND? Would not be an issue for me to replace it with a new one...
And what I learned from this - probably it would habe been better to flash root.ubi via usb and keep the uboot sector untouched, I think my scope would still show some signs of life then....
Keep you updated...
Franz