If you are like me and was doing some miscellaneous things using fast boot or recovery or whatever and screwed up your phone then here is the solution to fix "The system has been destroyed " error on your Redmi Note 9 Pro. I didn't try this on the Note 9 or Note 9 pro max so I don't know about them.
- Extract the "vbmeta.img" to ADB fastboot folder (where the fast boot is installed, if you don't have fastboot installed, download and install it from the attachment below ).
- Open command-line tool and paste:
fastboot flash vbmeta vbmeta.img
- Boot to recovery by pressing and holding Volume Up and power buttons.