The Flash Update & Restore process for the Apple Security Research Device will frequently require a new IMG4 Signature from the Tatsu Signing Server after a series of events or patterns.
This Article covers the installation, configuration & use of debugserver on the Apple Security Research Device by the SRDC for iOS 15.1, as of October 25, 2021 using IPSW iPhone11,8,iPhone12,1_15.1_19B74_Restore.ipsw.
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