Also just installed it.Just installed 5.20.02 on my C8, living in Europe. I had issues with Dolby Vision black crush, but at first sight it seems better now. I will test in a pitch black room tonight!
Please can someone with an earlier firmware check in the Service Menu, 13. OLED options, and confirm if they have the GSR option? I think it's been added to the menu. Default "on".
an old pic I had:
Part of me wishes I hadn't cropped it so much - but anyway., today's version of the same menu, after updating:
EDIT: @jrref I wonder if you know what this option does?