The factory reset does a format on the partition. Then it copies the basic files to the partition. If the file system is corrupt after that, it probably means the internal micro SD card is faulty. There has been at least one report of this happening with a new Glo. The person was having weird problems, opened the device and extracted the card and tested it. He found errors so he took it back. Or maybe they just decided to put a new larger card and continue to use it.
Trying a manual format won't harm. If it doesn't work, it will only have cost a little time.
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