Download the wireless device configurator.
https://apps.apple.com/us/app/wireless-device-configurator/id1531831585
TEXT GUIDE
1. Open app.
2. Tap Gear Icon > Click Service Login (inactive) > Type sw in password
box. >Tap Activate
3. Tap <Back <Back (Go to Home) and tap Setup> tap your Sensor > Tap
Setup
4. Tap Extended Functions Scroll to the Bottom and Tap Special
Parameters > Make sure "First large echo" active is enabled
5. Tap Amplitude threshold threshold "first large echo" > Make it 12 DB
> Tap OK
6. Tap <Back <Back (Go to Home), >Tap Gear Icon> Tap Service Login>
Tap Deactivate