What size is the micro SD? It won't recognize larger ones. I forget the cutoff. Could Google it. I've used 8GB and 16GB. My 200GB doesn't work in a Coldcard.
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Asked the Googs. Google says 32GB is max.
Try to update to an intermediate version (e.g. 5.2) and then to latest. There seems to be an issue with large version bumps.
Solved - thank you homies
I tried 2 different size microSD - 2 gig and 16gig, neither worked. I ended up using Mac terminal to update firmware on Coldcard, got new seed generated using 99 dice rolls. What a giant pain in the ass. I love you guys.
Glad you're good