![]() Make sure you have a valid copy of macOS installer app in Application folder. ![]() This is the quickest way to fix M1 Mac can’t create bootable macOS USB. Fix #1: Code Sign createinstallmedia Command Now, here comes the question: how to fix this error so we can make a bootable macOS installer on a M1 Mac? Don’t worry, the following tricks will help you get out of the problem. ![]() That’s why createinstallmedia command gets more chance for failure on M1 Mac. What is more, Apple Silicon Mac (M1 & M2) has additional code signing requirements for apps. If the app does not have a valid code signature, it would fail to run. Third-party apps also needs code signature since macOS 15 (Catalina). By default, all apps in Mac App Store are code signed by Apple. The purpose of code signing is to prevent Mac from malware and virus attack from installed apps. The code is generated by Apple so it is quite safe.
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