when I still had the uniquefire uf2100, tried to pry it off too without success, yeah, hats off to e1320.
i got the uf2100 wanting to convert it to 5 modes from this old link https://budgetlightforum.com/t/-/4210 , but I think the 3-mode drivers are now different. Pulsar, before you swap for a 105c, you might want to check that old driver to see if you can do the 5-mode conversion. If it works, i might have to un-gift the 2100 and try it out myself. :)