A correct way for 7.0.2.007 and S905X is to boot without device tree. If your WiFi doesn't work, connect via Ethernet and post logs (very important: collect them right after a fresh boot!). Maybe the WiFi chip is not supported yet. In most cases it's quite easy to add a new chip.
Here is the log file from a fresh install first boot.
ALSO, I am using Pulsar's build
Thanks!
-Nathan