FAT16 is usual for 2 Gig and less cards and the update will work fine formatted in FAT16. Generally there is no need to format the card.
The caution about the state of the battery should be early. The unit should have a battery with a full charge or be plugged into the AC outlet prior to beginning the update. It is better to be safe than sorry.
No need to have to go through resetting the device if the instructions are correct.
Dale
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