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iPhone 5s has the Checkm8 bootrom exploit (permanent, unpatchable). However, Checkm8 alone cannot bypass SEP requirements for iOS 7. It enables:
But without SEP emulation (not possible on A7), iOS 7 cannot run securely.
The iPhone 5s (A1453, A1457, A1518, A1528, A1530, A1533) originally shipped with iOS 7.0 in September 2013. Downgrading to iOS 7 in 2026 is extremely difficult and generally not recommended for production devices. Apple no longer signs iOS 7, and the 64-bit A7 chip in the iPhone 5s imposes stricter security checks than older 32-bit devices. While tethered downgrades or dual-boot setups exist for advanced users, an untethered, fully functional iOS 7 downgrade is largely impossible without specific saved blobs and significant technical expertise.
If you were a genius in 2014 and saved your SHSH blobs for iOS 7.0, 7.0.4, or 7.1.2, you have a chance using Prometheus (or futurerestore). However, because the 5s relies on a nonce collision, and iOS 7 doesn't support APNonce, this almost never works. Downgrade Iphone 5s To Ios 7
Verdict: Statistically irrelevant. If you have to ask how, you don't have the blobs.
Do it if:
Do NOT do it if:
This is the only untethered method (meaning you can reboot the phone without a computer). It exploits the fact that Apple kept the iOS 7.0.x to iOS 7.1.x OTA (Over-the-Air) update signatures alive for years for the 5s, because the 5s technically came with iOS 7.0.
Requirements:
How it works: The 5s originally shipped with iOS 7.0. When Apple released iOS 7.1, they issued a "delta" OTA update. The signing keys for that specific delta update were left active. This tool tricks the iPhone into thinking it is receiving an official OTA update to iOS 7.1.2, even though Apple no longer signs the full IPSW. iPhone 5s has the Checkm8 bootrom exploit (permanent,
Steps:
Success Rate: High (90%) if you start from iOS 9 or 10. Verdict: The best method.
iOS 7 is ancient history in terms of security. It contains countless unpatched vulnerabilities that have been exploited over the years. Using an iPhone 5s on iOS 7 as a daily driver connected to public Wi-Fi is a security risk. But without SEP emulation (not possible on A7),
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