John began by researching the downgrade process. He discovered that it wouldn't be easy, as Apple had stopped signing iOS 7.0.4, the version he wanted to downgrade to, months ago. However, he found a few online forums and guides that claimed to have workarounds.
In the modern era of iPhone security, downgrading is usually impossible. Apple stops "signing" older firmware versions usually within a week or two of a new release. Once the signing window closes, the device refuses to install the older software.
Because iOS 7 is unsigned, standard restoration methods will not work. You must rely on advanced, community-developed jailbreak bypass tools. Downgrade Iphone 5s To Ios 7
To bypass this, developers utilize a technique known as . However, on 64-bit devices, if the currently signed SEP is completely incompatible with the destination iOS version, an untethered restore will fail or break device functionality entirely. For the iPhone 5s, an untethered downgrade to iOS 7 using blobs is only fully functional if you are downgrading from a version that shares a compatible SEP baseband, which is no longer signed by Apple. Alternative Option: The iOS 10.3.3 OTA Alternative
Use your downgrade utility tool to decrypt and extract the iOS 7 bootloaders ( iBSS , iBEC , DeviceTree , and the kernelcache). John began by researching the downgrade process
Because Apple is not signing this software, the phone cannot boot past the Apple logo on its own.
For a true iOS 7 downgrade, developers have occasionally released tools based on "de-re-f0rce" or "Divisé," but these are highly technical and often result in a "tethered" boot—meaning you need a computer to turn the phone on if it ever restarts. Method 2: Using CoolBooter (The Easiest Workaround) In the modern era of iPhone security, downgrading
The iPhone 5s contains a permanent hardware vulnerability in its boot ROM called checkm8. Because this exploit exists in the physical chip, Apple cannot patch it with software updates. This exploit makes unsigned downgrades possible. 3. The Secure Enclave Processor (SEP) Compatibility