0x06b - Update Jailbreak Content (by @NowSecure) #2145
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cpholguera
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TheDauntless
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Jul 8, 2022
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| <img src="Images/Chapters/0x06b/UDID-Finder.png" width="100%" /> | ||
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| If you are using a macOS version before Catalina, you can find the [UDID of your iOS device via iTunes](https://medium.com/@igor_marques/how-to-find-an-iphones-udid-2d157f1cf2b9 "How to Find Your iPhone\'s UDID"), by selecting your device and clicking on "Serial Number" in the summary tab. When clicking on this you will iterate through different metadata of the iOS device including its UDID. |
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Apart from the screenshot, the Medium article doesn't really add anything. Shouldn't we just create a screenshot ourselves?
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| **Recommendation:** if you have a jailbroken device that you use for security testing, keep it as-is unless you're 100% sure that you can re-jailbreak it after upgrading to the latest iOS version. | ||
| iOS upgrades are based on a challenge-response process (generating the so-called SHSH blobs as a result). The device will allow the OS installation only if the response to the challenge is signed by Apple. This is what researchers call a "signing window", and it is the reason you can't simply store the OTA firmware package you downloaded and load it onto the device whenever you want to. During minor iOS upgrades, two versions may both be signed by Apple (the latest one, and the previous iOS version). This is the only situation in which you can downgrade the iOS device. You can check the current signing window and download OTA firmware from the [IPSW Downloads website](https://ipsw.me "IPSW Downloads"). |
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It's also possible to save the blobs when the signing window is active: https://ios.cfw.guide/saving-blobs/
You should then be able to revert to those saved blobs. Our recommendation should thus be to save these blobs for all minor version updates.
Co-authored-by: Jeroen Beckers <info@dauntless.be>
TheDauntless
approved these changes
Jul 8, 2022
Co-authored-by: Jeroen Beckers <info@dauntless.be>
cpholguera
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Jul 8, 2022
cpholguera
changed the title
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Just moving a section around and fixing some links.