Search this link for the firmware version you want to download: https://resource.heltec.cn/download/HRI-485X/
Enter debug mode
Switch on the power supply, press the button to enter the configuration mode, and then the white light flashes quickly.
Enter the configuration page
Locate the device hotspot and connect to it. Enter 192.168.4.1 on the web page to go to the device configuration page.
If you forget how to access the diagram configuration page, see Quick Start.
Click on the red box below, select the firmware you downloaded, and then click Upgrade.
After the upgrade is complete, all configurations will be reset. You need to go back to the configuration page to complete the configuration
Common problems and solutions
The browser will not connect If you type “192.168.4.1”, the browser will not connect,please check if you are connected to the WiFi of the device you are configuring.
Device not working After each configuration, you must press the switch to put the device into “work mode”.