(Q) Downgrading was a pain, i donít want to go through that again, is there a way i can protect my PS3 from accidental upgrading ?
(A) You can use Team Rebugs firmware spoofer, it spoofs the firmware, so that when someone attempts to update the PS3, via internet, the PS3 tells them they are already on the highest firmware, as an extra precaution, you should remove your consoles access to the PS3, when you are not around, you can grab your spoofer, from the offical Rebug site here.
I don't know I this is a typo, but don't you mean you shouldn't connect to the internet, rather than to a PS3 :D ?
Anyway great guide! Thanks!