Screwed my whole system how do I completely remove?

[Dean Whitten]

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Mac model: MacBook Air 2017
iPad model: iPad 2017

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Not sure what went wrong but lost the back up file and just want to remove the patch and all completely, but it crashes everything on my desktop when I try to do anything , browser crashes when I try to type and/copy /paste

[Ben Zhang]

The problem probably occurred in step 8 when code signing SidecarCore. An invalid code signature will cause application crashes. If you lost the backup file, you'll need to properly execute step 8 to sign the patched file. Make sure Xcode is installed.