Hi
Wanna flash plain openwrt. Anyone used this router with plain OpenWRT? Will Adblock software work normally on it?
And will it automatically turn on wifi after flashing? Because I simply don't have anything to attach ethernet cable to.
Installation instructions and other info is here:
https://openwrt.org/toh/gl.inet/gl-x750
Yes, but it does depend on the size of your block lists... there's only 128MB of ram in your device, so large block lists could present problems.
No. Wifi is disabled by default on all OpenWrt installations for devices with ethernet ports.
You'll need to find a way to connect -- a usb ethernet adapter would be a good way to do this (they're cheap and easy to get, extremely useful to have around).