Just upgraded a RPi2 fresh 9.2.1 to 9.2.3 without issues.
Also fresh install of 9.2.3 works.
Maybe removing "quiet" from /flash/cmdline.txt will give more information.
Hi
removed quite from cmdline and booted..nothing...
removed overclock ....nothing...
copied a fresh config.txt from a new install...nothing
New install works fine tough...now waiting for my latest backup to restore..
restore didn't work either