Ioshackz.com Apple Stops Signings iOS 14 To Prevent Users From Jailbreaking Apple released has stopped signing iOS 14, which implies that iPhone, iPad, and iPod Touch users who have updated to iOS 14.0.1 won’t be able to downgrade to iOS 14.
Today we’re releasing checkra1n 0.11.0 with support for iOS 14 on A9(X) devices and lower. For newer devices, we need more time to work around a new security mitigation.In iOS 14, Apple added a new mitigation to SEPOS on A10 and above (except on Apple TVs and iBridge): if the device was booted from DFU mode and the Secure Enclave receives a request to decrypt user data, it will panic the device. Since checkm8 does not give us control over the Secure Enclave, this is not trivial to workaround. However, with the recently published blackbird vulnerability, we areable to get control of the Secure Enclave on A10 and A10X and disable this mitigation. Support for A10 and A10X devices is being worked on and is expected to be ready in the coming weeks.
You can always check ipsw.me to get notified when Apple stops signing a certain iPhone operating system version.