I use an Oppo A 54 and had received an update prompt that Android 11 update had been downloaded and if I wanted to install it now or later so I clicked on view more details and changed around a few settings. The moment I exited out of the app the Android 11 update had gone and it says my system is completely updated. I have tried restarting the phone but to no avail. I've just bought the phone probably 3 weeks back. Have I lost the update forever? I'm kicking myself right now for not clicking install now right away.