Hello, I found another workaround that you may find easier to use, but it will also require a computer running an older system (I tried with Big Sur and Mojave, but I guess it will work with Big Sur and Catalina too). In my case, I was preparing JOGL libraries (see forum.jogamp.org/JOGL-for-Mac-ARM-Silicon-td4040887.html ) to make Sweet Home 3D run under Big Sur ARM. I compiled the libraries for x86\_64 then for arm64, prepared universal libraries with lipo command and signed them with codesign. But when I tried the application under macOS X 10.10, I encountered the "code signature invalid" error reported here. Then, I tried to reverse lipo and codesign processes, wondering if a universal library built from signed sublibraries would work, and this seems to be the case. I'm not 100% sure about it because I experimented this way of doing only on libraries and not on a .app bundle which includes such libraries. So, if you have already some universal libraries try this: under Big Sur, go to the folder where your libraries are stored and extract x86\_64 libraries to a x86_64 folder with a command similar to: 	find . -name "*.dylib" -exec lipo -extract x86_64 -output path/to/x86_64/'{}' '{}' ';' extract arm64 libraries to an arm64 folder with a command similar to: find . -name "*.dylib" -exec lipo -extract arm64 -output path/to/arm64/'{}' '{}' ';' under an older system, go to x86_64 folder and change the signature of x86\_64 libraries with a command like: find . -name "*.dylib" -exec codesign -v -f -s "Developer ID Application" --options=runtime {} --entitlements path/to/entitlements.plist ';' finally under Big Sur, go to x86_64 folder and rebuild universal libraries with a command similar to: find . -name "*.dylib" -exec lipo '{}' path/to/arm64/'{}' -output path/to/yourApplication/'{}' -create ';' To apply the same procedure to an executable, just replace *.dylib by the name of your executable or read "find" man page. Of course, it's more than advised to backup everything before doing this. One last detail, be sure to compile your libraries and executable with -mmacosx-version-min=10.9 option as suggested at https://stackoverflow.com/questions/41865537/how-does-apples-codesign-utility-decide-which-sha-algorithms-to-sign-a-shared otherwise it still won't work.