Okay,
I've followed the instructions in the link provided above by the letter, using a linux shell and a specifically installed browser. First of all, the browser say "404 file not found" and second using the telnet command the shell says "Connection Refused" This mean, my router even if it's listed above, it's not vulnerable to this.
So, before installing the beta firmware, check if your router is actually vulnerable. If not, wait until the firmware is fully tested and relased!