Thanks for contacting us. How could we help you and what about the SD card compatibility issues are you referring to?
And for SD card, extendable to 128G. Flash Plus 2 could recognize Fat16, Fat32, Exfat, NTFC, and you could use FP2 to format your SD card to FAT16 & FAT32. And some other users also facing some cases about SD cards, sometimes it is about the quality of the cards. So we also suggest that you could check some other posts of the same topic. Thank you.