I'm still on iOS 6.0 jailbroken iPhone 4 Tmo. Carrier firmware is 13.0 I'm having some weak signals and tricky hotspot starting up. Will this Tmo carrier update 14.2 help? and will I have to update to iOS 6.13 and lose the jailbreak? I'm willing to do that since iOS 7 is gonna be jbreakable right away?