New 1.1.2 OOTB, downgraded to 1.1.1, can't connect to wifi.....!!!!

Has this been documented anywhere and is there a way around it? I'm just trying to jailbreak a 1.1.2 (downgraded to 1.1.1) phone so the ipod etc can be used. I've tried everything. I've even tried downgrading to 1.02 and I still can't connect to my wifi (It works fine on my other phone and laptop, and has no security).

I've added prefs://1f and it can see my wireless connection, but when I try and join it just says it can't.

Can anyone help me jailbreak this phone?

Thanks guys, hoping you can save the day ;)

Simon