Unfortunately, a further recommendation is to use the Sony flashing tool, Emma, to downgrade the Android version. Emma only runs on Windows. I don't have a Windows PC. So, I will either need to borrow a Windows PC, or try it with Virtualbox/Qemu.
I suspect borrowing a Windows PC might be the easiest route.
A new epic adventure is about to begin. My quest is to have a privacy-respecting, and functional, mobile 'phone that can also make calls using VoLTE and WiFi calling. My travelling companion will be Sailfish OS. I'm not expecting it to be an easy journey.
My first step was getting a compatible 'phone. Here it is, my Sony Xperia 10 III. The Xperia is currently running Android 13. I'm going to revert it back to Android 11, as per the recommendation in the Sailfish docs.
