A gentleman with a similar problem solved it; perhaps this will help:
If not, let’s start with:
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Confirm that from the Rachio’s location, you can connect from your smartphone to the network you are now trying to use with Rachio, that no login is required to access the internet, and that you have decent signal strength. If you still have anything set up on that network regarding MAC address filtering or static IP address, remove them and retest with your phone.
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After power cycling the Rachio (and it has had time to boot up and fail to connect to Wi-Fi), what do its lights show?
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If you attempt blink-up at this point, does the light pattern change? If so, what is the new pattern?
Report which devices you tried for blink-up. If any are Android, use
or similar and report the signal strength of your network at the Rachio location.