OpenSprinkler › Forums › OpenSprinkler Unified Firmware › Announcing OpenSprinkler (not OSPi!) Firmware 2.1.1 › Reply To: Announcing OpenSprinkler (not OSPi!) Firmware 2.1.1 December 9, 2014 at 5:38 pm #34939 RayKeymaster @automate: the recommended way to upgrade is to use the firmware updater program. If you need to look for the firmware file, it’s in the subfolder called Firmware. All firmwares are in .hex format (not .bin format).