@Craig: after upgrading to firmware 2.1.9, I recommend you to do an explicit factory reset (even though the firmware update should trigger a reset, we’ve found a few cases where explicit factory reset resolved some flash-related issues). The reset procedure is:
– power off the controller, then power it back on, and as soon as you see the OpenSprinkler logo, press and hold the first push button (B1) and continue holding it until the LCD shows ‘Reset?’ or ‘Factory Reset?’
– press and hold third push button (B3) until the controller reboots itself and completes reset.