Samsung H5550 firmware downgrade?

[frk16]

Hi all,
I have Samsung HT-H5550 home theatre system connected to LG tv via HDMI ARC. My desktop is also connected to tv via HDMI. When I am playing game or watching something on my desktop pc, I was getting all sounds from home theatre. There was no problem until I update sound system firmware. Now I can not get any sound. Is there any way to downgrade its firmware? Current version is 1018 and old version is 1017.

 

[frk16]

Problem solved. Every reboot tv or sound system, I need to re select from sound system HDMI ARC option to "auto" to "open".