Connect the card over USB and read it. Take it out of the device, or switch the device off, first.
A copy of the whole card, exactly as the device wrote it (.img), to keep or to put back.
READ CARD to see what the card holds.
Update the card's firmware, or erase the card. Out of the device.
What the card holds stays on it.
1. CHOOSE the new firmware (a .uf2 file). 2. CONNECT, then UPDATE: the card restarts in update
mode and shows as a drive named RP2350. 3. COPY TO RP2350 and pick that drive: the card takes the
new firmware and restarts with it. Then CONNECT again.
A blank card, as from the factory: everything the device stored is erased. SAVE CARD BACKUP first to keep it. Then format the card in the device.
Everything the card says.