I am interested in beta testing. I'm currently on V188.8.131.52. I'm having some buffering on 4k videos on my Vizio P75-F1 even on my 450 down comcast internet via my SB6190 modem. I'm familiar with downgrading firmware if the update becomes problematic so I'm willing to try new beta software. I believe I was in beta before some time ago, prior to my 4k entrance. I'm considering trying the XR700 but would like to beta the Orbi further before taking the plunger. Thank you for your consideration.