Bootp dhcp broadcast flag

Hi - (I have an ASUS RT-AC87U), and I'm having a problem with one of the devices on my network (an EE/T-Mobile Signal Box), which I think may be related to a recent firmware rolled-out to my ISP's cablemodem/router (VirginMedia SuperHub2)

(here's a link to the discussion thread in VirginMedia's forum)

http://community.virginmedia.com/t5...o-v2-01-03-broke-modem-only-mode/td-p/2860733

Is there any way that I can view/set the bootp dchp broadcast flag...

Bootp dhcp broadcast flag