Same issue where I get the screen to hold down exit. Holding down Exit does nothing, though, from India.
I have my little cousin who went to my house and he changed the guide to only show SD channels. That didn't work. I had him disconnect the HDMI cable. That didn't work.
I mean, that damn screen goes away and I can navigate to my favorite known stations, but I have no way to look at my DVR list. I will have some serious Open Championship and Big Brother withdrawal since I am stuck here until the end of July...
I have a HR24 feeding high def tv in bedroom via hdmi, the same HR24 feeding a kitchen tv and bathroom tv via modulator. Everything worked great until the HD guide switch. What I learned is to change the channel to 100 to get the receiver in SD mode and then i can browse my guide, playlist, ect on the remote tvs (controlled by a rf remote) and then select what i want. I still have the nag screen on any hd content but goes away quickly. I try and use trickplay the majority of the time to prevent the nag screen from showing up.
You could also have your cousin just set up the resolution of your box to 480i and everything should just come across fine.