TCL 65P815 firmware update problem and few things

Hi,
My problem is with 65P815. Fabric software was v084, i tried to update to V191 official version from TCL page, but after update and turning off TV, there is nothing shows on screen. I hear only sounds, and remote clicks, menu gone etc.
I search for info, and go back to v083 software, that helped and fixed TV. But now I don’t know what to do to fix my TV. Tried to update with factory reset, nothing helped. Any tips how to deal with it ?

Next thing is concerned with soundbar thing, I have LG soundbar, is it possible to control soundbar over TCL’s remote ? On my old Samsung TV it worked normally.
Here in TCL I don’t see option to choose sound sourec (tv speaker/optical/hdmi), there is no option to mute TV speaker and move sound to soundbar. For now I use 2 remotes, but I want to use only one like in Samsung. I connected soundbar with optical cable to my TV.