To have the needed amount of renown to get the upgrades to your sub or to change your U-boat model use the following procedure (You have to be in the base after a mission for this cheat to work): Enter the "\sh3\data\cfg\careers\" folder. Select the name of the folder that is the same as the career that you are using. Use a text editor to edit the file Patrols_0.cfg (make a backup first!). Scroll down to your last mission details and change the amount of DeltaRenown that you got paid. Example: (DeltaRenown=498.750000 Change to DeltaRenown=6500.750000) Save the file and start the game. You can now buy what you like in the game.