IoT Wireless Air Velocity Sensor Make sure the PC has
USB-serial driver https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers?tab=downloads
To update the firmware, you will need a
USB to Serial Converter(PR55-68 or any USB to serial) Windows PC Board name PR55-72 Note: if the file name has any special char, please remove it
How to put in program mode
Start the programming utility.
Select the correct COM port.
Select the updated file.
Click update immediately.
Press and release the RST button
Once the firmware update is finished, the device will reboot