I lost use of the WFM after a manual update to 632 about 2 weeks ago.
I’m on Android and have never seen the “remove flow meter” option under the “pairing” button that some iOS users have screenshotted.
I did a factory reset of the controller with no change to WFM connectivity. After the reset, incidentally, firmware indicated was 615, but then reverted without my intervention to 632 at some point when I checked again later. I’ve removed the WFM’s batteries as well.