SRD Flash Recovery

srdutil: Failed IPSW Update. Proceedure for dylib check: MobileDevice_AMRestorableDeviceLoadDidPanicFunction_block_invoke-securityresearchtools-20c80-srd-example
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Executive Summary

This Article will cover Flash Recovery & IPSW Restoration on the Apple Security Research Device. Bricking the SRD happens from time to time and these instructions should help you Recover quickly.

SRD Brick
SRD Bricked and ready for Flash Recovery



SRD Flash Recovery

The Flash Recovery Process is a work-in-progress Upstream and reading runtime.h is suggested. All Flash Updates can be done with Finder or srdutil. If you see an Error Message for your SRD, open Terminal and follow the Instructions below.

Apple Security Research Device Error Message during Restoration of IPSW
Flash Recovery: Apple Security Research Device Error Message

Start by opening your Terminal and Paste in the following command which is specific for iPhone11,8,iPhone12,1_15.1_19B74_Restore.ipsw on October 25, 2021:

defaults write ipsw-variant -string 'Research Customer Erase Install (IPSW)'

If you use a Beta IPSW such as iPhone11,8,iPhone12,1_15.2_19C5026i_Restore.ipsw on October 27, 2021:

defaults write ipsw-variant -string 'Research Developer Erase Install (IPSW)'

The next step is to killall Finder in Terminal, Paste in the following command:

killall Finder

Open Finder, Click on iPhone 11 as shown in the Picture below:

Apple Security Research Device presented in Finder to begin to IPSW Update Process
Apple Security Research Device presented in Finder to begin Flash Recovery & Restoration

Step 4: Hold the Option Key and Click Restore iPhone. Use File Picker to Select the IPSW to Flash. Same process for a Retail Device. I’m using iPhone11,8,iPhone12,1_15.1_19B5060d_Restore.ipsw.

Step 5: Verify the Logfile, this Log Message means you’re Updating the SRD.

requested variant: Research Developer Erase Install (IPSW)
amai: AMAuthInstallBundleCopyBuildIdentityForVariant: searching for variant Research Developer Erase Install (IPSW) (0 recovery)
amai: AMAuthInstallBundleCopyBuildIdentityForVariant: AMAuthInstallBundleCopyBuildIdentityForVariant: Found variant: Research Developer Erase Install (IPSW)
amai: AMAuthInstallBundleFDRSupported: FDR is supported for this device
no override trust object found
requested variant: Research Developer Erase Install (IPSW)


srdutil is the command line utility found in Security Research Tools 21C39.

DYLD_PRINT_APIS=1 DYLD_FORCE_FLAT_NAMESPACE=1 srdutil restore -v -s -S  -e 0x1538d03c40012e -i ~/Downloads/18C66.ipsw

Additional information for srdutil can be found here.

Example SRD Cryptex DMG Install
/bin/bash -c "$(curl -fsSL"
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