Here’s a trouble shooting guide for non-cooperative SD cards:
No special preparation is needed to use SD cards with the Nano. If you have issues, you can try the following steps:
- Check that your card meets the requirements stated in the BenF readme file
- Upgrade to the latest version of the firmware (LIB and APP)
- If possible, verify that the card works outside the Nano
- Reformat the card with your OS (FAT16 or FAT32)
- Or if no success - reformat using “sdformatter” (version 2.x is a good choice)
- Try a different card