I just flashes OperWrt to a Linksys EA4200v2 router, but I can't access the web GUI at 192.168.1.1.
I flashed the router w/ firmware version "openwrt-kirkwood-linksys-viper-squashfs-factory.bin", using the LinKsys GUI.
I can access the internet with the router's internet plug connected to my provider's (ATT) DSL router, so it appears to have flashed successfully.
I'm not very skilled at linux, so any instruction will have to be pretty basic.