i just got an email from the seller-
If you peel off the front sticker of the 2A you will see some greyish rubber materiel to the right of the switch.Straighten a paper clip, or something similar, and stick it into the rubber and move it about and up and down.What you are doing is trying to short the side of the lithium battery to reset the TT.It may take several attempts...This should work and unfreeze the unit.
Handy tip if you gotta un freeze or reset your hours as it did work BUT, it froze shortly after while running my motor on 2100 revs then turned off!! think i got a dud