LG Optimus S

[NooBzHate]

Ok, so I'm having the problem that apparently everyone else is having. I need to downgrade my Sprint LG Optimus S to android version to the one below 2.3.3. The reason I need to do this is because I can't connect to my wifi and I heard this was the reason. The thing is, is that I know there is tons of these threads posted on her about it that work and stuff but I'm not that good with all this technical stuff. Is there anyway that someone could give me like a step-by-step process from like step one like I just started. I don't know anything about rooting or downgrading and replacing files. Like I said I know absolutely zero about this. I just really hope someone can help me. Like a guide for dummies. I don't really know what all info you need so I'm just going to list some stuff.
My Phone Info:
Model Number: LS670
Android version: 2.3.3
Baseband version: LS670MVJ_6150
Build Number: ZVJ.47B56B4
SW Version: LS670ZVJ