I use 6.0.8, 7.0.1 and 7.5.5 on my SE/30 with absolutely no ill effects -- ever, so far.

8.1 wouldn't work with 1.0b10, so I had to upgrade to 1.1a3, which has no issues. The issue is not System Picker, but more likely hardware.

I did buy a tool with a bunch of small Torx bits but it was Chinese (and I hate Chinese tools, or any cheap tools in general) and was rubbish. Returned it, I'll have to figure out what Torx size the screws are and figure out how to take it apart, with consulting the 2300 Technical manual.