The problem that iGS620 can't be connect with any sensors could be solved by upgrade the model from iGPSPORT app at the step2.
Step1: Upgrade the firmware at website1. Download the firmware file V1.20 at http://global.igpsport.com/home/download
2. Copy the file to iGS620 as below:
3. Once upgraded, the firmware will be showed as below: (SETTING>about)
Step2: Connect with APP to upgrade Model1. Open iGPSPORT APP and connect with iGS6202. Upgrade the model to 109.3. A short video for upgrading from APP for reference https://youtu.be/hQJOlroqE8o
In this case, the device hadn’t been upgraded successfully.
And the problem could be fixed by upgrding the device from APP.More details ,pls find at the webpage:http://global.igpsport.com/home/download