So I followed a tut and typed in custom number (16747) and built the image and everything but now that I'm trying to connect to live it's asking me to update the dash...can I update?
No, That update is ment for a retial console. U must uodate on XeBuild (u can find the one u need on apkmods), then uodate like that
go to system setting, system info if you are on 16747 then yes it is ok for you to do the update it will only be a avatar update
Yup if you already updated to new dash like hacker said it's just avatar update which is fine or if you don't want to risk it for some reason download the system update files to USB jrunner give you the option as well