this firmware is not signed. this means you cannot restore to it in itunes.?

Restore iPhone to Unsigned iOS Versions | FutureRestore Tutorial 2021 | MacOS/Windows/Ubuntu

Is It Possible to Restore To Unsigned IPSW? Yes, you can restore your iOS device to an unsigned IPSW firmware, but not in the traditional way. Usually, when you want to upgrade or downgrade to an iOS version using the IPSW restore file, you will do so through iTunes.

Restore Any iPhone/iPad to Unsigned iOS Version using SHSH Blobs – FutureRestore Tutorial 2021

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