Ok Guys So Here’s the FIX with BIG SUR I did few modifications with whatever was available on internet to solve this problem Step 6 & 7 are few modifications which I did.  Here it goes Reboot in recovery mode (CMD+R) Utilities -> Terminal csrutil disable csrutil authenticated-root disable mount - uw /Volumes/Macos (Enter WHATEVER YOUR MACOS DRIVE NAME IS, my macOS drive name is Macos) cd /Volumes/Macos (Enter WHATEVER YOUR MACOS DRIVE NAME IS, my macOS drive name is Macos)/System/Library/Extensions rm -rf AppleThunderboltNHI.kext rm -rf /System/Library/Caches/* Kmutil install -u --force --volume-root /Volumes/Macos (Enter WHATEVER YOUR MACOS DRIVE NAME IS, my macOS drive name is Macos)/System/Library/Extensions bless -folder /Volumes/Macos(Enter WHATEVER YOUR MACOS DRIVE NAME IS, my macOS drive name is Macos)/System/Library/CoreServices —bootefi --create-snapshot FORGET THE PROBLEM :-D  You’ll need to perform these steps every time you update Big sur with their security updates n all.  No need to enable SIP  Have a good life :-)