I have a jtagged Xbox 360 and Call of duty: advanced warfare But when I launch disc 1, it says "press start to install content pack 1". And when I do press it, it says no save device chosen, press A to choose." When I press A nothing happens. Please give me a solution to this.
This may sound silly but, do you have a hard drive installed? Also, are you loading the content from a GOD container? If you're try loading the game into a external device, booting it from there to install the content.
Extract the contents of the ISO on your PC using Xbox 360 XISO. Then FTP the data from the Content\0000000000000000 to your internal hard drive, after that the content disc is essentially installed and you can just play as any other game using the other disc. Content installers for games like this never work unless they are running from an actual physical disc.
I actually use ISO2GOD to turn the game from ISO to GOD then use Horizon to move the game to the external hard drive then play it.
That's why you have a problem, the game has an install disc with some content to install which does not work on anything except a DVD. You need to extract that content from the disc and manually inject it in to the hard drive, you can then play the game as normal with the other disc.