OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Firmware upgrade of Rayshobby Raspi 1.2 doesn't work › Reply To: Firmware upgrade of Rayshobby Raspi 1.2 doesn't work
If you are referring to the Unified OpenSprinkler Firmware: there is no firmware 1.9.0. The latest firmware is 2.1.8. Instructions are here:
1.9.0 is likely a third-party firmware not written by us.