Bad news for would-be jailbreakers of iOS 8.2 beta 1 or beta 2—both firmwares are no longer being signed. There seems to be conflicting reports going around about whether or not Apple has killed access to beta 1, beta 2, or both beta firmwares, but I can personally confirm that Apple has shut down access to both.
Why is this significant? It's significant because iOS 8.2 beta 1 and beta 2 were the only firmwares available that allowed users to jailbreak using PP Jailbreak on Mac or TaiG on Windows.