Concept of Unlocking: 

Toyota smart key, once been programmed to a car, it cannot be programmed to another car, unless been unlocked.

Unlock Steps:

Step 1: Press and hold button 1, 2, and 3 at the same time (the order marked above)

Step 2: After the indicator light is on, keep button 1 and 2 still and release button 3. After the indicator light goes off, press button 3 again.

Step 3: Repeat Step 2 ten times until the indicator light flashes continuously, then release all 3 buttons. After the indicator light stops flashing, the FT key is successfully unlocked.