Hi flurians,
VM are updating the 360 boxes in stages. Mine updated to 4.31 two weeks ago and my resolution hasn't changed.
Some posters have indicated they are already on 4.32.
Which version are you on?
Have you tried rebooting the 360 to see if that solves the issue?
Also you could try a factory reset. System > Factory Reset.
With the 360 you won't lose your recordings as it's not a complete factory reset, however you will need to sign into apps such as iPlayer and ITV Hub again.
Dave
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