Problems installing OpenWrt on Comfast E-355 v2

Hi there,
I tried to install OpenWrt on my comfast e355 v2 ap but I cannot reach the admin page after I upgraded to this version: openwrt-18.06.1-ar71xx-generic-cf-e355ac-v2-squashfs-sysupgrade.bin

Can someone help me to get my router to work properly?

thx