My iphone 3gs was on ios5, i downgraded it to 4.3.3 and jailbroke it with redsn0w with ipad baseband but the cydia icon was white and wouldn't open, i googled and tried all fixes with no luck, i also has no signal with my sim in. I just want to upgrade to the latest firmware and i'll get the carrier to unlock it but the error i get when i try and upgrade is "The iPhone could not be restored. An unknown error occurred (3194)". Now i have a iphone stuck on 4.3.3 that won't upgrade and has no signal. Any ideas on how to fix it, even just to get my signal back is appreciated as i've been trying for 2 weeks! My baseband at the minute is 06.15.00-6.4_M3S2.