Before hunting for a code, try the free version. It allows you to enter and exit Fastboot and Recovery modes for free. You only need the registration code for the advanced "Repair Android System" feature. How to Register the Software
Once you have a legitimate code (purchased or legitimately won), activation is straightforward: Ultfone Android System Repair Registration Code
You will receive a registration code via the email address used for the purchase. Before hunting for a code, try the free version