i have an UE55H7000 with T-MST14DEUC-2118.1 Firmware. First of all: OTN & OTA Support is OFF

I have heavily 3D Ghosting effects. Watching 3D Movies are so not possible. My brother, with an UE48H6600 can view the same Video, from the same Source, with the same 3D-Glasses without such effects.
Is a Firmware Update to the newest 2781 Firmware helpful in this case and will I still able to root the TV after Update?
Or should i Update to a Firmware like 2130? Is this possible.
Or what could i do else?
Greets
EDIT: I fixed the 3D Ghosting by updating to 2130.0 -> then I did root and installed oscam