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I have gotten my CFW prepared and loaded to NAND and as expected ASR kicks back when authentication fails. in older firmware I was able to find the address to remap easily, but the asr from arm64SURamDisk.dmg in 10.3.3 isn't as obvious. Do you know what registers/address I need to patch?
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You need to find the conditional branch that performs the check and sends you to either the "Image passed signature verification" or the "Image failed signature verification". Search for any of these strings in your disassembler and find the address.