Use the iPhone Browser or a similar app to enter the 
"/var/mobile/Driver/Driver.app/data" directory. 
Edit the "mladder.dml" file and find the following lines: 

#President render 

RENDER 70 

Delete all lines above those entries. Start the game and begin a new 
undercover career. The ending sequences and credits will begin. The 
cheat options will be unlocked afterwards. 
Copy your original ""mladder.dml" " file to its original location 
to return to standard Career mode.