Looks like this thread talks about the key needed to program:
https://budgetlightforum.com/t/-/53726
Along with the programmer from the README:
http://bazaar.launchpad.net/~toykeeper/flashlight-firmware/trunk/view/head:/README
There is some “discussion” around a standard - can anyone advise if that oshpark key is suitable for the LT1 driver?
Edit: Or is it this one? https://budgetlightforum.com/t/-/72815?page=2 