🎉

I can only find pictures of 6-lobed Gamebit screws

I think I found it, it’s this kind: https://ctatools.com/products/5065x12

thanks, this might be just the comment I needed! Some of the screws are sunk into a very deep hole (~60mm), so it would be tough to cut a slot into those. But i’ll give it a try on one of the more exposed screws, just to see if that gets me anywhere.

true, looking at second pic it’s very hard to make out. I tried to capture it on the first picture, but it’s not that good

yeah, it is inverted (or “external” torx according to your link). They also made sure to sink the screws into a whole where no pliars will fit…