Jailbreaking aPS3 Slim (CECH-2104A)

Hi, i'm new on jailbreaking of PS3.

Seached around on internett to jailbreak my PS3. I am on OFC 4.30 software from Sony. Must I use a E3 flasher or can i use Rogero 4.30 v2.03 to jailbreak my PS3 from the OFC in safe mode or?

Or must I downgrade to 3.55 OFC or what? :confused:
This is a original Norwegian Slim verson. (CECH-2104A)

Hope for som help or guide to do this :)
Thanks.