I have a 4th generation iPod touch which was working perfectly until I downloaded ios5 and now it won't connect to my wi-fi - all other devices working correctly. Where can I download ios 4.3.5 from?

I have a 4th generation iPod touch which was working perfectly until I downloaded ios5 and now it won't connect to my wi-fi - all other devices working correctly. My pc didn't create a backup before updating software so I can't revert back to ios 4.3.5 from there, where can I download ios 4.3.5 from?

I tried just about everything and finally brought my Ipod touch to the apple store.  The tech installed ios 4.3.5 but still no WIFI.  He recommended a $149 exchange - not really a bad deal with a new battery and 90 day warranty, but I thought I'd try again.
The "solution" was bizarre.  On YouTube was a fix involving taking the motherboard out and heating the wifi components with a heat gun.
I did not like that idea, but another involved turning it off, putting it in the freezer for five minutes and restarting.  It worked!  I must admit the fix does not work reliably, so I may still go for the exchange.  Still, I am now convinced that it is a hardware problem.    i remember back in the old days, TV repairmen sprayed a suspected bad resistor with Freon.  The chilled component would work long enough to identify what needed replacement.  Perhaps something similar is happening here.
For anyone wanting to try this, I found it more convenient to place the back of my ipod on a  frozen cold pack until the wifi is restored.  It seems to happen when condensation forms on the face.  I used a towel to wipe off the moisture so as not to add to the problem.

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