i used the img file, isn`t that the right one?
→ ok, 
, tar is fine. upgrade in progress…
wow, I am flashed about the real cool performance of the version 3 on gl-ar300m.
the gui is wonderful, the firewall configurator is very well too!
→ I am going to use the router mode for my setup with wlan ap and lan device in lan port.
many thanks to all, who have helped me in that!