I accidentally pressed b while updating a game on xbox 360?

The game is minecraft and at 75% done I sat on the controller and it pressed b and exited the update and went to homescreen! So I went to minecraft again and the loading screen looked really old, and then it said i needed an update so i updated. Then it didn't update at all! It showed all the old blocks I was already using!

Help! Please ITS BEEN LIKE THIS FOR A MONTH!
I don't have the horse update, I'm stuck on the older verison.

They haven't added horses to Minecraft Xbox 360 yet