Make them send out a technician to manually update the firmware if that's what they require but tell them you have no Wi-Fi and they can take this garbage back and give you your money back and then you can sue your builder to put an appliance that works but until people begin to hit these places in the pocketbook and vote with their dollars this kind of trash will not change.
I don't want to have to buy an "internet of shit appliance" that needs to be on the internet because they shipped it with broken firmware. They can either take it back or they can send a technician to conduct a warranty repair. The only exception would be something that's bold and bright on the front of the box that says internet connection required to function. Most of these things don't say that they just say Wi-Fi enabled. Which is a fine benefit for those people who want that kind of interconnected appliance and spyware lifestyle. For those who do not the correct action is hit the company's in their pocketbook.
The loss of dollars is the only message that companies understand loud and clear. A Twitter complaint is just wasting your time.