Apple has stopped signing iOS 26.4.2 and iPadOS 26.4.2, officially preventing iPhone and iPad users from downgrading from the recently released iOS 26.5.
Instructions on how to jailbreak and unlock your iPhone 3G on the iOS 4.2.1 firmware using RedSn0w for Mac. This tutorial can update your baseband if needed for unlock.
P0sixninja has revealed that he will not be using his jailbreak exploits to release a jailbreak for iOS 6.1.3; rather, he will be holding them back for iOS 7 or iOS 7.1.