Help | reviving cobra ode or something else?

hi there,
i am having ps3 CECH-4004A running 4.65 (official) that had cobra before it has been mistakenly update to 4.65.
i have some questions:
1. i wonder if there is a way to retrieve the cobra ? if so how? and if i am needing something more then my ps3 and a PC?
2. if the answer is no (or there is a better way then cobra), is there another way i can run games from hard drive? if so how? and if i am needing something more then my ps3 and a PC?

Thanks