Original key and a new key
In X300 DP Plus, select Toyota/Lexus->Smart Key System->Type 4 (with H)->Program Smart Key
Put an emulator ke close to the ignition switch and turn it ON till the dashboard turns on
Put an available key close to the ignition switch and turn on ignition, then buzzer beeps once
Close a new smart key to the Start button
Programming new key in process
Test the new key.