Refer to the steps below to rule out basic issues.
For details, please see this guide: https://support.makeblock.com/hc/en-us/articles/15959305251223
In a Nutshell
#1 Check the Firmware
Make sure the firmware version is up-to-date.
For details, please see this guide:
#2 Check the Connection Cable
#3 Check the Ultrasonic Sensor
Please contact Customer Support for advice.
Feel free to contact us at:
Help Us Solve Faster
We have listed some useful information you can provide to us.
When you contact us, the more information you provide,
the better informed we will be and the quicker we can advise and answer your questions.
Not Sure Where to Find the Version Info?