NOTE: I only use Windows 11 on my Laptop 13.
My BIOS upgraded from 3.18 to 3.19 okay and hasn’t caused any major problems. I used the Windows .exe updater.
There could do to be a better warning that the reboot does not signal that the process is complete and the delay before the second reboot was also rather longer than I expected, but probably only 15 seconds or so. I don’t know if it would have mattered if I’d interrupted it, but I didn’t.
The sound level from the internal speakers seems a lot quieter with this BIOS. But turning the volume too 100 still exceeds any volume level I will need, so still usable, I just need the volume at 40 or 50 instead of at 20 now.
Maybe the Realtek loudness equalisation feature is changed (or broken) in BIOS 3.19? I’m sure turning on loudness equalisation used to make the speakers a lot louder, but now it only makes a slight difference.
Anyway something to do with the speakers has definitely changed, but at this stage I’m thinking it’s just something I’ll need to get used to, rather than a problem I have to learn to live with if I stay on BIOS 3.19. Perhaps after a while I’ll realise it’s actually better this way?