Was curious about a Light L19 seeing how cheap it is now and did some digging around for how to update. This Github project from an XDA thread may do the trick
https://github.com/helloavo/Light-L16-Archive
Oh wow, this camera! I saw it years ago and never thought about it again. It's such an interesting idea for my field of work that wants variable focus throughout a video shot with high speed photography, but can't get it with the equipment that exists on the market.
thanks for this, I've been needing to factory reset my L16 but I couldn't locate any of the firmware