SPI on A5..A7 not accepted... - ERROR: Pin A5 is not capable of SPI SCK...

There are 3 SPI peripherals (physical bits of hardware) and you can choose which pins these map to - but you don't get much choice. Most peripherals have very simple choices:

• Use pin set 1 (eg A5/6/7)
  
• Use pin set 2 (eg B3/4/5)
  
  

Sadly you don't just get to choose exactly what you want where... Unless you use 'software' SPI