I'm mostly lurker here, but assuming you meant 6V boost driver then first who came to my mind are
loneoceans (https://budgetlightforum.com/t/-/65319)
thefreeman (https://budgetlightforum.com/t/-/65759)
and Mike C (https://budgetlightforum.com/t/-/66233).
Probably there are more members able to design it.
Please have in mind that it is very important that there is enough space in flashlight head to fit coil that that boost driver require. I do not owe EA01 so can't promise it is possible to make such driver for it and more experienced users need to make comment here.