snapshot dont have luci by defaulf, you just need to install luci, no need to try to flash again.
fix your cofig for minimun internet connectivity via ssh:
vi /etc/config/network
and then:
opkg update
opkg install luci-ssl
also next time no need to use factory image you can use sysupgrade image, if luci doesnt accept image try from ssh or uboot will do.
next release will fix this… ar750s nand is not in stable repo yet… you can dig a bit a look at the image builder… pretty easy to use for custom needs… no need to compile from source.