Try formatting the usb stick to FAT32 and see what happens.
Tried that but I get the same error.
So far I've tried:
Latest
official firmware on USB 3.0 thumb drive formatted both FAT32 & NTFS inserted in each of the (3) USB ports using both the "push-button/paperclip" and the "settings" method.
Latest
custom firmware on USB 3.0 thumb drive formatted both FAT32 & NTFS inserted in each of the (3) USB ports using both the "push-button/paperclip" and the "settings" method.
Latest
official firmware on a SD card inserted into the SD card slot using both the "push-button/paperclip" and the "settings" method.
Placed firmware on internal SD card and tried to update from there.
Numerous factory resets.
Anything else I can try? Installing the newest beta or an older firmware perhaps?
Any assistance would be appreciated!