MVP - 1

The update framework is the second thing you figure out and don't cheap out on.

No in place updates, everything needs dual firmware support with the 0 stage bootloader in ROM.

Their doodad had all the features. Yours has a really great update framework. Guess which one gets funded at demo day, or makes it to retail shelves this christmas?

If your doodad has a weak enough update framework that it bricks itself a handful of years after production, good luck getting any revenue or funding going forward.

Too late .. already ~scammed~ ~ran away with the money~ I mean "pivoted"

The _second_ thing you work on.

UL listing should cover certificates, update, and boot resiliency.