Hi I'm currently having an issue with my Iphones wifi and it appears to be a software issue. I want to upgrade the firmware, but there isn't any jailbreak available for the latest firmware. So my only option is to downgrade it but I don't know how. If someone can help that would be great.
How to downgrade my iphone 4s from IOS 6.1.2 to a previous version? - 1
You can't. You'll have to wait for a jailbreak release which most likely won't come until iOS 7.
It might not be the software have you tried looking at the wifi details forgetting the network and reconnecting again