Cobra 8.10 + CECH3004A

Hey guys
I have a question.
So i have a ps3 (ofc) and i installed HFW and PS3HEN
And i installed multiMAN because i wanted to transfer games
And i was just having a thought because multiMAN is saying that my system is
"Cobra 8.10 compatible"
And i'm just wondering if that's a custom filmware and if i can install it.

Just respond or message me because i'm waiting for an answer.

ok thanks bye.