The newer updates are not supposed to cancel the settings but some reports are showing the new upgrade to cause a blanking of the settings, but it is a little sketchy as to if everyone is having the problem or not, I think there is a possibility that some of those having the blanking issue might have done this updgrade from the original firmware which didn't allow for settings retention.
SPL meter? Theoreticlly not needed, just the mic and the autosetup routine. You do have an entire weekend to tweak it back up, what else is there to do?
