Is yours a X1 or a X3. Mine is an X3, which format the SD card in FAT32. Issue is that I used Windows 10 to reformat the cards to exFat, but still they were not recognized by either the A45 or my Sony camera. Sony UI compared to Fiio is night and day, the only thing I miss is the line out to feed my Fiio headphone amp. I hope Sony will update the firmware in the future to support the WH1000XM2 as currently the DSEE HX and Equalizer functions of the A45 only work for the audio port. If they can do it for iOS, they can certainly do for the proprietary os of the A45.