I don't know much about the ps3 scene, and I want to jailbreak my ps3

Hello, I have a PS3 slim with 12 gbs, yeah only 2 gigs -.-
The PS3 firmware is 4.31 version and the console is a cech-4004A.
Is there a way to downgrade this firmware to 3.5 without using a E3 Flasher? I don't really want to do any soldering on it, I'm really a noob in these things...
Thank you in advance guys :)