On my model it requires removing a surface mount "micro" component. It is referred to as a zero ohm resistor - aka a jumper. It is smaller than a grain of rice.Google the modification to your HT. Most of the time it is an easy code to enter after holding down a certain key while powering on. It‘s normally referred to as an “unlock” code. I did my Yaesu HT in about 30 seconds. I know I’m sounding like a broken record but the $25 Baofengs are already unlocked & will transmit on GMRS & the amateur bands out of the box.