I've always found best to choose low level format when formatting cards.If the card has not been formatted several times it can leave a ghost copy of the aircrafts firmware on the card and this will confuse the controller update
if you haven't solved the issue yet let me know, i have a "wipe" file for P3 controller which will basically bring it to
out of factory pre-firmware upgrade. it wipes the controller of all firmware updates and then you can put whatever
FW on it via USB thumb drive.
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