Thanks again. I’m not that familiar with getting “under the hood” of the Arduino IDE - I’ve found the SPI.h and CPP on my computer but when I open them in notepad I’m not seeing line numbers and whilst SPI.h has a 4000000 in it, I’m not seeing 12000000 and when I tried to change 4000000 it didn’t allow me to save the change? In short, you sound like you know what you are doing, but sadly I don’t understand 