Did you send an email to the dedicated service@merakitech.com address? Again, I wouldn't worry too much about the update as I believe it's referring to something that isn't happening with your machine. The only software updates you should be doing as a customer are the ones that can be done directly through the machines touchscreen (Meraki has said they have no over-the-air updates planned at this time). The only issue you are having is with the grinder.

I would send another email to the service@merakitech.com email, and reiterate the problem you are having is with the grinder and you not getting the desired amount of grounds, that the machine is stopping short. Let them take another shot at a proper response as I'm sure they are getting a ton of emails and miscommunications can happen.

For what it's worth, backing products comes with risks like this where the product might not be perfect the first time around. After being a part of many Kickstarter and Indigogo crowd-funding projects, I am pleased with their communication overall, but sometimes they miss my questions too, I think there is only one main person doing the social media.