Search for: Log In Register OpenSprinkler › Forums › OpenSprinkler Unified Firmware › Can I upgrade a v1.2u board with 1.8.3 firmware? Tagged: Upgrade This topic has 3 replies, 2 voices, and was last updated 5 years, 6 months ago by Ray. Viewing 4 posts - 1 through 4 (of 4 total) Author Posts October 9, 2015 at 9:50 pm #40480 RanaParticipant I bought a v1.2u board three years ago and just upgraded it to 1.8.3 Is this the highest possible release for my hardware? October 13, 2015 at 12:06 am #40502 RayKeymaster Sure, you can upgrade 1.2u to firmware 1.8.3. You will have to use the old version of firmware updater to do so. The link is here: http://www.raysfiles.com/os/osFirmwareUpdaterGen1.zip October 13, 2015 at 10:21 am #40508 RanaParticipant Thank you for replying Ray however my question is if I can upgrade to an even higher release than 1.8.3 October 17, 2015 at 11:30 am #40535 RayKeymaster Unfortunately not — 1.2u uses a small microcontroller (ATmega328) which cannot fit any firmware beyond 1.8.3. Author Posts Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In OpenSprinkler › Forums › OpenSprinkler Unified Firmware › Can I upgrade a v1.2u board with 1.8.3 firmware?