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Around 8:15 pm (Eastern USA) on Sunday, February 25, 2018.
I had nothing to lose. So, I updated.
Can’t see any differences, BUT then again, unlike many, I did not run into the sync issue after updating my Fitbit Ionic firmware to version 188.8.131.52 (i.e., Fitbit OS 1.2). I suspect that that was because of my Pixel 2 — which has the ‘latest’ hardware and Android software.
But, a heads up. Check it out. This might help you.