Realme has just announced that they are offering an open beta of Android 13 to all users who own Realme 9 Pro and 9 Pro+.
In order to take part in the beta you need to follow this short instructions.
Go to Settings > Software Update menu and tapping on the Settings icon in the top-right corner. After that, click on Trial version > Open Beta > Apply Now and submit the required details. You will receive the beta update if your application is approved.
However please remember that like every beta, there will errors and problems with the system, so we strongly advice to not use your main device.