Just bough new ms909 and decided to try backing up scan folder of internal memory. Used a new usb 32gb flash drive in fat32 format but didn't work. I believe not enough memory on usb as the ms909 had 31.7gb stored from factory. So I deleted a bunch of auto makes I will never see in both apps and in scan folder so it dropped internal storage down to 27gb but still fails to back up. Any recommendations. Also wondering what format a mini sd card should be in to double memory from 128gb to 256 gb