Finder.app won't open after I edited Info.plist I'm on macOS Mojave 10.14.3. I wanted to remove the Finder.app from the CMD+TAB, so I followed this tutorial and this solution to be able to edit the Info.plist file.

The steps I followed were:


Reboot into Recovery Mode
Run csrutil disable
Reboot into normal mode
Edit Info.plist as root
Run codesign -fs - /System/Library/CoreServices/Finder.app/ as root
Reboot into Recovery Mode
Run csrutil enable
Reboot into normal mode


After those 8 steps, I expected to get my system working normally, but without Finder.app showing up in the CMD+TAB. Instead, I got a system where I can't open Finder.app at all. When I try to open it, it will say "The application 'Finder.app' can't be opened."

So I decided to revert it, I did all the steps like before, but now I removed the additional lines from Info.plist. It didn't work, Finder.app still won't open, even after I changed Info.plist to the original state.

What can I do?
I would boot to internet recovery or another OS and reinstall finder by reinstalling the OS. That leaves all your apps and files intact and fixes whatever problems finder had. 

I have fast network, usually have both the internet recovery image and the OS cached on my Mac mini that runs caching server (or Mojave cache service), so the operation takes 5 minutes instead of 25 that is typical on fast networks.