49" Curved Gaming Monitor Odyssey G9. Lösungen und Tipps, Handbuch herunterladen, Kontaktieren Sie uns.. Samsung Support Schweiz
www.samsung.com
Sorry, I simply searched for it with google and got the Swiss page. But give it a try.
But perhaps that file does not fit to your G9, depending on your country.
I read in a forum, that some firmware-versions are only for some countries., but not for all.
Could be, that the update will not work either.