Ditto X4 stopped working, all LED's green – that's it

Ditto X4 stopped working, all LED's green – that's it

wow.
brand new, worked 2 days.
then updated to the newest firmware – now all LED’s green, nothing works.

restarted, nothing. not recognised on my mac any more, nor does it make any sound.

any solution is highly appreciated.

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Source: http://forum.tcelectronic.com