LVFS tames firmware updates

That's why you're much more likely to get protocols described in datasheets or supplemental manuals than sample code. Businesses have IP that they don't give out, IP that they give to customers, IP that they give to anyone, and IP that they pay people to take (e.g., ads), and the departments responsible for making sure the right thing happens tend to categorize based on the form of the IP rather than trying to understand its purpose.