How to update the firmware for HS-1, TS-1, TS-2 or ARS-1
Firmware update by a Micro SD card
Go to the firmware update page and download the firmware to a Micro SD card. Only put one firmware file in the root of the SD card each time.
Unplug the RJ12 cord from the device and insert the SD card into the unit. Press and hold the ADDRESS button and power the unit by plug in the RJ12 cord. The update will be done automatically.
Youtube video: https://youtu.be/2ftzNV3lzw4
*Caution: firmware update is not necessary unless you aware of the new functions are what you need. Some updates may caused a factory reset which will lead to a loss of all setting.