Several days ago I’ve flashed my 10 III with Android 13 (62.2.A.0.525) using EMMA and then SFOS on top of it. Result? A considerably better working device than on Jolla’s recommended Android 11. None of the people I spoke with confirmed hearing any echo, and the display’s green/yellow tint issue is also gone, without any kind of fix being used for that. At the same time, I haven’t noticed absolutely any negative effects. So I can actually RECOMMEND flashing SFOS over Android 13.