It happened to you for a different reason, but it seems you have the same behaviour as me and other users that flashed the wrong firmware on our l176fcn.Hi all
I own fengmi 4k l176fcn but unit failed on my when upgrading software. Was in the procces of upgrading when my power went off. Now projector wont turn on. Been trying to get in to recovery mode without luck. When plug it in power botton flash 3 times and switch off. When trying to get in to recovery mode power bottom stays lid all the time
Did anyone had similar situation. What would be solution in this case
Did you do a full backup?
Have a copy of your dev/block/backup?
If the answers to the above are "no", i think your only option is to try flashing the batman firmwares from post #4 and see if you are lucky and one of those resurrects your projector.
Maybe wait for somebody else feedback before doing it for sanity check.
Another thing you can try before any flash is to reset your projector from the standard recovery, assuming you are accessing it and it's just the screen not working.
You have to blindly do the steps with the remote for full stock recovery. Spocky posted the sequence to do with the remote or just watch a YouTube video and replicate the same steps if you don't find Spocky's post