Just picking this up, I’m also struggling to get larger cards to work with Proffies. I just bought some 32GB ones from here as they were cheaper and looked to be higher spec than the smaller cards:
Shop looks legit and the card was solid and fast in my computer (unlike some knockoffs I’ve had in the past, which are flaky from the word go) so I think they’re legit, but I keep getting SD card not found in serial monitor. Tried a 2.2 board and an old 1.5 board, both with the same very basic config. Going back to one of my known good SDs works straight away.
Is there anything else I need to do to get larger cards working with Proffies?