I am using an Arduino Mega and have the hardware well setup now. I have first been using the sketch Atmega_Hex_Uploader. I can read the SD card. I can also flash the hex file to the target. No problem ...

So, I have been using MightyCore for years and today I saw there was an update to 2.2.2 but I also saw there was an arduino cli update so I did both at once and everything broke. I realized that my ...