Can't downgrade from iPadOS 18 to 17.7 using IPSW file

Question

Can't downgrade from iPadOS 18 to 17.7 using IPSW file

Starting today, I am unable to "downgrade" from iPadOS 18 to 17.7 using an IPSW file and Apple Configurator. I've tried two different Macbooks and two different Lightning cables. I am getting the following msg:

OS cannot be restore on "Ipad"

Personalization failed [com.Apple.MobileDevice.MobileRestore - 0xFBC (4028)]

In the past few weeks I have been able to do the downgrade on several iPads, no changes have been made to either Macbooks I am using.

Thanks in advance.

iPad (7th generation)

Posted on Nov 6, 2024 12:18 PM

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Answer 1

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LotusPilot

Community+ 2025

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Nov 6, 2024 2:42 PM in response to michael@vistaMS

All System Updates are digitally signed by Apple - and can only be installed whilst the digital signatures remain valid. After release of a new iOS/iPadOS version, the immediately preceding version continues to be digitally signed by Apple - however, usually within a few days, Apple will revoke the digital certificate with which the earlier version is signed.

iPadOS 17.7 is reportedly no longer signed - preventing reinstallation. iPadOS 17.7.1 is current.

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