Upgraded to Dexter OS Ver 2.1.1
The usb drive is no longer recognized, cannot save files from Bloxer menu.
And photos from the camera are not saved.
Tried reformatting Windows 10: FAT32 with drive name GPG1 (no spaces)
Switching back to the Ver 1.1.1 SD card, the same usb drive did work to upgrade to Ver 1.3
It also works to save files.