I'm sure you guys get a lot of these but I kind of need some help installing Openwrt on an Asus RT-AC1200 v1, if I go to the firmware selector page there's only two options, KERNEL, which as far as I understand is not meant for every day use, and SYSUPGRADE which according to what I read is for routers that are already running Openwrt.
Are you saying that the sysupgrade file is missing from the Firmware Selector?
What fruther documentation are you seeking - and for what purposes (e.g. to setup WiFi perhaps)?
(EDIT: after re reading, it seems you're concerned about following the Wiki steps - not sure why, I assume because this device doesn't use/need a separate "factory image" - but you're seeking more Wiki instructions/docs?)