It could be:
1) low battery
2) Which model of Q are you using the update on? make sure both the version match. For example: if you are using a Q9m make sure it is a Q9m.
3) There is something wrong with the hardware itself and not allowing the firmware to be written back to it.
Those are the only problems I can think of.
Another method may be to try to flash the monster to it and if it doesn't take then try the update.
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