How do I update the firmware of my ARS-1?

Make sure you are using a 32GB or less micro SD card, download the firmware to your SD card, insert the SD card at the bottom of your ARS-1, remove RJ12 cable from your ARS-1, press and hold the address button, keep holding the address button and plug the RJ-12 cable back in, keep holding the address button until you see the update screen.

Firmware:

https://www.trolmaster.com/Products/FirmwareUpdate?class=Support