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Aha. I completely missed the ATMega328P (old bootloader) option I had simply selected the ATMega328. I did find this out by reading through the forum just before I read your reply. Thanks for the confirmation. I used your bit of code to turn-on just one LED at coordinates 0,0,0 and it worked. Then I...

I only have a windows 11 PC but I have installed the driver this forum recommended for use with the cable. However, I can't upload to the cube whether using Arduino IDE versions 1.8 or 2.3.3. I tried pressing the reset button as 'uploading' appears in the Arduino IDE but I just get 'sync' errors eve...