OpenSprinkler › Forums › OpenSprinkler Unified Firmware › Remote/Extender not working? › Reply To: Remote/Extender not working? July 16, 2022 at 10:44 am #73395 girvin13Participant I am having the same issue. My “master OS is an older 2.2 version running the latest FW. My OS 3 wifi is my slave. I have tried the OS 2.2 as master and slave, and cant get to run either.