Error
Make sure your device is connected in DFU mode Checking theiphonewiki for 13.3 keys... Found Keys! Downloading 13.3's BuildManifest.plist Extracting: BuildManifest.plist, from iPhone_4.0_64bit_13.3_17C54_Restore.ipsw Getting SHSH for signing images ERROR: Failed to save shsh
Maybe today the issue is related to different problems than it was year ago, but anyway I wanted to share observations:
Today I noticed this issue, and found out it is related to resources/bin/tsschecker. This app now fails with making checks for iOS 15 (something changed in requests with the newest system release). tsschecker is called from resources/img4.py. So to make it resolve probably you can open /resources/img4.py, search for line:
so = subprocess.Popen(f"./resources/bin/tsschecker -d {tssmodel} -e 85888280a402e -l -s", stdout=subprocess.PIPE, shell=True)
and replace it with:
so = subprocess.Popen(f"./resources/bin/tsschecker -d {tssmodel} -e 85888280a402e -i 14.8 -s", stdout=subprocess.PIPE, shell=True)
tsschecker -l parameter stands for "latest (system version)". We can change it with lower version -i 14.8