Yes, I found that weird too. Even Z97-A got update, but not this one. Maybe I'll try to contact ASUS support and see what they think. TBH It would have been nice to have that BIOS, but I'll give up of they can't provide one. Thanks for reply!Its odd they never pushed 3503 onto that board, I had a Z97 Pro WIFI and they pushed a beta bios out for it to match spectre = https://www.asus.com/supportonly/z97pro(wifi_ac)usb_31/HelpDesk_BIOS/
but not for yours. Interesting - https://www.asus.com/supportonly/z97pro_gamer/HelpDesk_BIOS/
I don't know why? I can only see people installing it after altering bios in some way. I can find unofficial bios that have changes but not sure I would trust them, and not going to link to them. Some Asus Z97 boards got updates in April 2018