Android 12 problem

I have updated my phone to the latest Android version (12) and now the DJI fly app will not even load up. I have installed Litchi and this has cured the problem, there are many benefits over the DJI app so far. The question I have is how do I update my Mini2 and the controller firmware now that the app will not run. I have downloaded and installed DJI’s supposed fix from their site using the APK file but that partially loads then locks up.