DFU Failure - Quarq Dfour

Tried to update my firmware today through my phone. Can connect to the PM through bluetooth and see an update is required but when it comes to updating the message saying there's been a DFU failure and disconnects.
Anyone have ideas as to a solution?
Anyone have ideas as to a solution?
"A cyclist has nothing to lose but his chain"
PTP Runner Up 2015
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Graham
PTP Runner Up 2015