Remove bottom cover on the radio, face radio up so you can see behind the display into the main chassis. Look for 2 chip resisters that are 0 ohm, one is located center of radio faceplate to the bottom of the board where the two boards meet, it will have an open spot next to it. The fourth one is the one you want, lift it carefully. I found another 0 ohms resister on the other side of the chip and removed that as well. My 2 HTX-252s both transmit from 136-174 and I didn’t lose my memories either.