I've recently started playing on an Xbox One, using a Xbox Profile/Gamertag that I previously used on an Xbox 360. In all of the Xbox One interfaces, and on xbox.com, I see the "Gamerpic" avatar that I recently selected:
However, when I'm playing Xbox 360 games that I've downloaded onto my Xbox One, I don't see that picture. Instead, I see the "Gamer Picture" that I previously selected on my Xbox 360:
I'd like to change my Xbox 360 avatar to something new. (It seems like these avatars are drawn from different libraries, so I don't expect to be able to use the same avatar on both platforms.) If possible, I'd also like to change some of the other Xbox 360 profile settings, such as the "Gamer Zone" (which is no longer displayed on-console but is visible in some places in the web interface).
I no longer have an Xbox 360 available. Is there any way to modify these legacy Xbox 360 profile settings from an Xbox One or, failing that, the web interface?