Hello,i buyed for cheap like 10€ this device,now question how to properly install newest and supportable stable version of openwrt in to this device do i need know some tricks/tips or just via web interface?Because now he is with asus stock firmware.
Did you read the device page and still have some questions?
in first me readed in there,but yes have questions is that bad to have questions?
What are your questions?
one simple question how to install in this device openwrt just simple via web interface or its bit harder?
You install according to the instructions found on the page linked above. There are two install methods noted there.