To make this clear… When you click on btn0, btn1’s text changes from ‘NOT READY’ to ‘READY’ and when you release btn0, btn1 text goes back to ‘NOT READY’?
Text and colours change, as many times as I click it… yes 
Ok, thanks. At least the code works. Will continue tomorrow as it’s 12 midnight at this end of the world.
@Gunner thanks for your help. After a good night of sleep, went back to the coding board and found my error. I was using the on/off conditions whereas you used only the off.