@darant 

After installed this firmware i will try to turn back with flashing official firmware but now i received only an error !

Why?

Is not possible to turn back with official firmware?

And probably now is not possible to make an downgrade but  in the future i will upgrade this modem with new firmware?

Please give us an answer !

@bartvz, first thanks for the reply.. 

About the firmware i would like to turn back in warranty because in this modem i have found several problems... 

The mobile network with mobile operators my modem is ok also before but is obviously more performance with this firmware. 

My modem have the wifi power that grow up and down and this is not good for me... I use more the wifi connection in my house and with this modem is impossible to use these two wifi networks because this growing up and down make the connection unstable and my wifi extender became crazy because is always red situation because the WiFi power is unstable.. 

Other think is the ghost network... What is this ghost network that come out and immediately after desappeared?. . Is for mesh devices? To have a connection to these mesh devices? 

So i would like to turn back to install the previous version of the firmware to make a procedure to turn back in warranty... And i do not want to have a problem with the warranty! 

If i do not turn back.. With the old buggy version Is possible to make a version that not show the confidance words? 

Thanks for your work! 

@Robynbra have you resetting the router to factory settings to get rid of the ghost network?

Else, have you tried accessing the telnet server? From what I can see you can manually edit config files so that might be worth a shot :)

@bartvz ,

Obviously i have reset several times my modem but the ghost network come out always look here:

http://www.imagebam.com/image/2af8f11345681750

http://www.imagebam.com/image/8d1dbd1345681817

You have talking about telnet this was an older command too many years ago!

But how?

And the two wifi network is terrible for the power that grow up and down and not are stable!!

@Robynbra Guest networking off?

@darant ,

obviously yes!

I never have activated the guest networks...and the selector is in "off" mode....

so Or there is a problem with this modem that this ghost network is for mesh devices or sometimes this modem turn on the guest network but after more second turn off?

Possible that no one people have seen this ghost network?

@darant do we have similar beta version for mr400 to select network bands.