This is the holy grail. A fully custom IPSW where the bootloaders (iBEC, iBSS) have been patched to disable signature checks. You could theoretically restore to this firmware using a tool like sunst0rm or iPwnder32 .
If you’re interested in legitimate iOS security research, I can instead help you with: modified ios firmware iphone 11 patched
# unpack IPSW (conceptual) unzip iPhone11_iOS.ipws -d unpacked # analyze kernelcache with tools kcache_tool --extract unpacked/kernelcache This is the holy grail
: Removing "bloatware" or background processes to speed up older hardware. modified ios firmware iphone 11 patched