I used safeb9sinstaller as i used soundhax and followed 3ds.guide.This wouldn't brick your 3ds, but it would corrupt Firm0, and your 3ds would instead launch Firm1.
If you used safeB9Sinstaller, you will notice no difference since Firm1 has B9S.
If you installed with b9stool, you would revert to clean firmware. (since b9stool only installs to Firm0 out of safety concerns)
If you have arm9loaderhax, you will brick.
The way to test b9stool is to uninstall cfw from Firm0, then test it.
It's 3am now anyway, so i wont bother with it and i guess i dont really have to.
Thanks for the explanation, though