I was surprised to hear that if you have a wristband display for your GoWearFit armband, and don't subscribe to the web service, that you can no longer use the armband once its memory is full.
If true, this seems rather unfair. Also poor business practice - the person in question wanted to buy a second device+wristband to replace a lower quality competitor unit, but was unwilling to pay for two unused web subscriptions. I seem to be driving multiple sales here...
I tracked down the command to clear the device memory of sensor data the same way the BodyMedia app does it.
A new bmhack update (bmhack-z717a) is available with a command line '--clear' command.
See the updated "release post" for the download link.
This feature, like everything else, is highly experimental. I have not yet received a single end user report - please provide them if you've used bmhack.
UPDATE 7/17: New version z717a. TESTED UNDER WINDOWS. More robust serial I/O.
UPDATE 7/18: New version z718a. New data record type added, thanks to Freak. Enhanced device memory dump capabilities for improved debugging.
UPDATE 7/18: New version z718b. Fixed limited memory bug (thanks again Roy!). Software can theoretically now handle a completely full device.