Firmware update for HP2551 - V1.5.4
Mainly Updates:
1. Supports max 8 WH51 soil moisture sensors.
2. Supports max 4 WH41 PM2.5 sensors.
3. Add calibration functions for WH31 multi-channel temp and humidity sensors/WH51/WH41(On Setup page, press More).
4. Add Sensor ID management function(On Setup page, press More).
5. Display multi-channel sensors(WH31/WH51/WH41) on the console(On normal dispaly, press the up-and-down arrow icon for 4 times)