Thanks, that’s good to know you were able to kind of “downgrade” to Volla OS 12 like this. So Android 14 should not be a very big problem, I guess…
I don’t know what exactly went wrong when you tried to flash SF OS, but from having read this thread I assume your phone isn’t really “dead” but just isn’t able to boot any more, and therefore can probably be recovered somehow.
Most people seemed to go back to Volla OS (or Ubuntu Touch) at first to revover their devices, so probably this is the way to go in the first place.
But I don’t have any experience with that, and probably others would also need some more information, for example what happens exactly when you try to power on your phone, and what you may have already tried to recover it?
Did you check if everything works (like camera, bluetooth, etc) in Volla OS, as often suggested before flashing SF OS?
And did you enable Devmode and USB Debugging and had unlocked the bootloader in Volla OS then?
And then had booted into fastboot mode in order to flash your device?
What version of UBports installer did you use?
I thought the option to install SF OS had been removed from current versions, and you would need to use the flash.sh script now?
(Maybe SF OS was removed from UBPorts installer because sometimes something goes wrong when installing SF OS and people end up with phomes that appear to be dead, so maybe installing SF OS isn’t really recommended to start with for not very experienced users. But that’s just my guess.)
Have you already tried to re-flash Volla OS 12 as you did before, or as written by other users in this thread that were able to recover their phones?
Or maybe also as written in that thread? Volla Installation guide
Maybe someone can help you to recover your phone if you describe which steps you have taken and what happened exactly when you did this.
Otherwise you might just read the last few pages of this thread and try if anything that worked for other people to recover their phones works for yours as well.
Also make sure your USB cable is good, maybe rather get a new one to re-flash your phone as this sometimes seems to cause trouble or even lead to dead phones as well.
Maybe also try a USB 2.0 port (or hub, if your computer doesn’t have USB 2.0 ports any more) as some people said flashing didn’t work correctly with all of their USB ports / USB 3.x
Let us know if you were succesful, and good luck!