OpenSprinkler › Forums › OpenSprinkler Unified Firmware › Firmware Update Problems (Hardware version 2.1) › Reply To: Firmware Update Problems (Hardware version 2.1) April 17, 2015 at 1:23 pm #36798 TechFanParticipant Hm. I thought when we discussed that before, it had looked possible. Download firmware file to SD, then run flashing command from within the device. Obviously, you would know though. Lol.