> That's like 100ms per test. Are those devices that fast to put into uart mode and reset and wait for the result? Were they running this with multiple devices

> That's like 100ms per test. Are those devices that fast to put into uart mode and reset and wait for the result? Were they running this with multiple devices in parallel? Whilst I expect they probably did use multiple devices, I regularly see reboot->uart in the range of 150-250ms. That being said, depending on what you do (like undervolting), you can see up to an agonising 500ms.