Prometheus, the iOS downgrade tool of foreign developer tihmstar, will be released before the end of 2016 as scheduled. Apple's upgrade mechanism is different from that of Android. The system still needs to be verified. Once Apple stops verification, Apple devices cannot return to the old version of the system. Prometheus, a downgrade tool, is designed to solve this problem, In the test video, he showed the process of going back to iOS 9.3.3.

The bad news is that there are more steps and restrictions in the method. Prometheus is based on nonceenabler, futurestore, imgtool and GUI, which are tools with upgrade or downgrade functions. It only supports 64 bit Apple devices (A7 processors or devices below 5s are not eligible). The phone needs to be jailbroken first and has "tfp0" or "host_get_special_port" (Pangu for iOS 9.1, JailbreakMe for 9.3.3 Prison break is supported, but the latter is an imperfect prison break, and the effect has not been verified). For a jailbreak device, you need to have saved the old version of the. shshh2 blobs file. Interested and experienced pilots can try to make fun of it.

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