x RELIC x
Headphoneus Supremus
just google how to format a sd card to fat32. it's not a new or unique question and you'll have plenty of tutorials for all kind of computers with all kind of OS. there is no trap, it's not difficult and worst case scenario, if it doesn't work, you try again. so don't worry about it. :wink_face:
Unfortunately for the FiiO DAPs not all format software works well. Recommend using the device to format the card as it works 100%. More than likely it's allocation unit size that causes issues. Just read the first 200 pages of the X3 Classic thread or the X5 thread and most of the issues with cards came from not formatting in the device.