So I'm about to give my old 3G to my cousin but he has T-Mo. So I jailbroke it and flashed it to 6.15 Now here's the thing, it won't connect to wifi. I know it isn't my router because my other devices could connect. I also restored it with a custom firmware and it still won't connect to wifi. Is it because of the 6.15 baseband? I know it can cause GPS issues but not wifi issues. Also, is it posible to downgrade to 3.1.3 with the iPad baseband?