MFP M425dw doesnt see WIFI channels above 11 and cant scan to USB in 600dpi

[kosr1]

I have WIFI network in my office that works on 13 channel, because all others are busy.... All my devices work fine on this channel except this MFP. So I was forced to change my wireless network and lost speed and signal distance.... Also I was surprised when I couldnt scan to USB device with more than 300dpi resolution !! For instance, more cheaper 225 model can scan to USB with 600dpi, but 425 NOT !! I have the latest firmware dated 24 feb 2016. Please help me with these issues

[sabretooth04]

Where are you located? 

HP Printers only can see up to Channel 11.  Channel 13 tells me you are in Europe maybe?

[kosr1]

yes, i'm in Europe, and this printer is officially distributed here, so it should support all local wifi networks.... isn't it ?

[sabretooth04]

Might want to verify with the local HP office if you have the correct firmware for your printer.