Firmware upgrade problem

I opened the “Structure” APP and tried to upgrade my MarkII firmware.I did get a firmware update notification, and I saw that it was successful, but when I came back in, and I saw this option,
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“About Your Sensor,” again, version 0.9.9.

Before and after the upgrade, the version number has been 0.9.9. Is this correct?

Why upgrade when the version number hasn’t changed?
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I believe 0.9.9 is latest fw

thanks a lot.
Do we need to recalibrate after updating the firmware?