I confirm it's a T8 security torx.
It's T8 or T9 ?
If you have read "All Tabs", the save should save all of them into the hex. The UI is not very good as you said! haha
Oops about the ERNI. I'll fix that.
If it can work with the STM8FLASH, I would use that instant of STVP (it's more complicated). I didnt try STM8FLASH with the Official ST-LINK/V2.
It's okay to have contributions, I made this to help, but I'm not a "Instruction guy" :P