For the whole weekend I have been fighting with the PandaPi board. None of the images in your google drive work, the Pi gives me the incompatible software flash code error for each one. I was able to install a Mainsail image and configure the firmware and flash the MCU using my PC. The Pi4B connects with the PandaPi board through gpio uart but when I configure printer.cfg it says diag_pin is in use via serial connection. How can I get around this?
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Can you double check step 8 from https://github.com/markniu/PandaPi/wiki/How-to-install-pandapi-to-the-latest-octopi-image