Hi,
just successfully updated my OpenSprinkler Pi to 2.1.7 I’m using a Pi3 and it worked flawless the whole season.
If you only want to update the instructions provided is incomplete:
First step you have to download the update by “git clone https://github.com/OpenSprinkler/OpenSprinklerGen2.git”
And for me the last step was power off then on again.
Now everything works perfect!
Hope this to be useful for others.
Greetings from Austria,
Juergen.