Sounds like a problem similar to mine.
Try download beta version again https://files.emlid.com/images/ReachImage_v2.1_beta.zip
Or here ReachView beta v2.1.5 update
At the bottom of Emlid menu (where you save wifi credentials) you can see current and new version to update)
To verify a successful flash? Im acctually not sure what i was thinking. I guess if everything works, its successfully 