Not much later after the new mobile Substrate for iOS 7, Saurik released an update for the Substrate Safe Mode allowing it to be compatible with newer firmware and A7 devices such as the iPhone 5s and iPad Air.
Here is the description of the update from the source itself in Cydia…
“Safe mode is a feature of MobileSubstrate that prevents your device from entering a permanent crash cycle by giving you a chance to uninstall malfunctioning extensions without a complete device restore.”
Basically what Safe Mode does, if you’re not familiar, is it prevents the device from going into an unstoppable crash cycle or bootloop and gives a chance to correct any issues. This allows you to restore the device without causing permanent damage.
According to iDownloadblog Saurik said, “As of version 0.9.4000 this package is even safer on iOS 7 (and on ARM64).”
Whether or not you have had any issues, it is recommended to update to the new Substrate Safe Mode. To do so head open Cydia, select Changes, Refresh and select the update option for Safe Mode.
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