prerequisites to downgrade from miui 12 to 11 using fastboot

Hi friends....
Recently i updated my poco f1 twice after an update which was 11.0.5.0 to 11.0.9.0 to 12.0.2.0.......since updating i hve been noticing some fast battery drain symptoms as well as some frequent lags which was never before seen......so i was hoping to go back to 11.0.5.0 update......learned about recovery rom process but have a doubt will it work since I am rolling back to previous version.....not latest so need help thanks