First, install the 6.4 version and install ATV Softcam Feed, then upgrade to the 7.0 version with online flash by backing up the settings.
With actuell ATV 7.0 you didn't must install first ATV 6.4,the ATV Softcam Feed 5.0 now works with ATV 7.0 too
No My friend ATV 7 doesn't accept to install any feed (By the way - where can download softcam feed 5.0. Thank you