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'when battery inserted now no lights blink at all'
Might be as a non-complete flash may have occurred.
'If you press the button the green light comes on and stays on'
Do the other three LED's blink at all, after the green LED is seen?
Is it possible the battery may have drained below a threshold to allow suitable flashing?
Two Puck's were mentioned in post #1, has the other battery, or a different battery been tried? Has the other device been tried? (I'd hold off on flashing the latter for now so that we have a working unit to compare with)
Let's agree to use the term 'blink' for LED indication and leave the term 'flash' for the actual process. Just corrected myself as I tripped up on that. . . .
I do want to mention again that during the flash process through android, at the end when it gets to 100% (blue light lit on puck) the blue light goes out and the android software says it has disconnected from puck and upload failed.