rvictl -s 0....E is failing.
Starting device 0....E [FAILED]
Tried on iOS 15 beta 3 and iOS 14.7.
I am running Big Sur 11.5
Tried solutions mentioned in other similar questions
sudo installer -pkg /Applications/Xcode.app/Contents/Resources/Packages/MobileDeviceDevelopment.pkg -target /
sudo launchctl load -w /Library/Apple/System/Library/LaunchDaemons/com.apple.rpmuxd.plist