Yes, only if you have the correct key flashed to the correct drive. I would just build a new retail image on the latest xebuild dash, and update from there. I say this because the incorrect drive, with the update will put Xbox live flags in the nand, and there is a good chance it will get banned if you finish the update and sign on to xbox live. My way clears all of those flags, and XBL will never know there was anything wrong.