Are you sure that this happend just after the Firmware upgrade?
Seems more like a hard impact on the LCD with breaking it or the connection not clipped in correctly

Same problem just started my machine. No logo showing.

Now, I did drop the build platform near the edge of the LCD where it says “DO NOT PRESS”

UNIZ could have designed the platform handle better so you can hold good while dismounting the wet platform.

I was able to print some jobs for a while even after dropping the platform for a couple of days and today it just not working any more. 

I still have the old version of firmware though I tried to upgrade the version but there is not a good instruction for it. 

I printed yesterday all ok. Woke up this mooring to print and it went through the motions. Went to collect print and …nothing.  So decided to do a vat clean and it made the usual wiring sound but no cured resin. Guess the LCD stopped working. What has failed while I was asleep? Please not the printer was switched off while I was asleep. 

I tried show logo and it didn’t. I have checked the cable on LED screen and that looked ok. But re connected to make sure. Still no logo