Please try to replace the firmware files on the FAT partition of a LE 9.2.3 installation with the ones from this ZIP rpi-firmware-9e3c23c.zip - you can do that eg on a windows (or linux/mac) PC.
See also this thread RPi3 Updade to 9.2.3 ending in Black Screen
It's a rather rare issue on RPi3s, but it's the reason why we haven't enabled auto-update to 9.2.3 yet. LE 9.2.4 will ship with the same firmware files as the one in the ZIP - so far this fixed all RPi3 boot issues.
so long,
Hias
I can confirm it's working.
Thank you Hias.