Note: An Xbox Live account is required. Go to "My Character" in the main menu, then go to "Reset Appearance" and make your character a female. Your guns, clothing and armor will remain there. Press Xbox 360 Logo and go to the Dashboard settings section, then go down to "System Settings". Go to "Memory" and press Y to go to the device options. After that, press X(2), LB, RB, X(2). Select "Yes" when asked if you want to perform maintenance. This will not affect your saves or downloaded content. After it is done, start the game again. It should ask if want to update. Select "No" then go to "My Character" again. Reset your appearance and change your character into a male. After that is done, press Xbox 360 Logo and go to connect to Xbox Live. When asked if you want to update, answer "Yes". After the update is done look at your character's rank. It should have gone up and you will keep the rewards that are given with that rank. You can repeat this as many times as desired.