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I'm wondering, how many companies that use ESP32 actually use the firmware security feature?

Almost everyone who's selling a real device, in my experience. It's pretty standard to disable firmware reads in embedded cpu products.

And from my experience, it's virtually none.

Since I first started work in OEM electronics in 2007, I only saw that being requested 3 times.

It's used on most consumer devices simply to slow down clone devices being created.

Here's one that definitely did not:

> Vulnerability n*2: No security settings (at all)

Yeah that's what I thought, like many of them don't really care about it...