www.chinaphonearena.com

just bought this box from amazon but have tried everything to update xbmc to gotham without any luck, keeps saying the following
an existing package by the same name with a conflicting signature is already installed.
ive tried removing xbmc but cant it was a pre installed and box has no root access

You may have to root and uninstall. The problem is likely that the upgrade carries a different signature key than the existing one. I've had the same issue with apps when included as part of the stock ROM and trying to update them.