SamyK released his code for hacking garage doors that use fixed codes. He took a Mattel Radica Girltech IM-ME toy, rewrote the firmware, and is able to open any of the affected systems within 29 minutes. Check out his code on GitHub along with his detailed explanation of how it works. He admits the code is bricked to prevent criminals from using the code. Here is a quote:
Moral of the story is get a device that uses rolling codes.