Temporarily disable security software and firewall
For many players, the problem arises when they try to use a (like the "secret codes" found in the game's options menu) and mistakenly call it a registration code. These serve two completely different purposes. Confusing one for the other is a frequent cause of the "code not working" error.
Paste these files directly into your main Need for Speed Undercover installation directory.
"Code’s gone," Alex muttered. "I tried the 'O's as '0's. Tried the 'B's as '8's. Nothing. It keeps saying 'Invalid Registration Key'."
The updated solution is not to "find a working key" – because even a valid key won't activate. The solution is to using community-made tools (No-CD, launchers, or mods). You paid for the game. You have the right to play it offline, forever.
By following these updated steps, you should be able to bypass the registration code error and enjoy the high-speed pursuit in Need for Speed: Undercover once again.
The registration problem usually stems from two main issues:
The "registration code" problem usually happens on modern Windows PCs. The EA authentication servers for this 2008 game are offline. The game loops the activation prompt even if you type a valid CD key.