Obviously a pin that needs to be low at boot you can't use with an external pullup, but you could use for something else that won't pull it up at boot.


Efuse read here https://esp32.com/viewtopic.php?f=2&t=1393

I was briefly looking at this and it seems there is compensation for rise/fall times built in so that if you have a weak pullup and a long rise time the high period timer is not going to start until the signal goes above 1.8v. Since the negative edge is sharp, the low time is accurate. So this is so...

You don't have to avoid strapping pins necessarily just make sure they will be the right state at boot or disable with efuse.

Gpio12 is strapping pin for flash voltage but can be disabled with efuse. Check pin list document or data sheet section 2.4 and see latest esptool update.

Strapping pins, gpio 12?

Have you considered setting flash voltage in efuse to bypass mtdi strapping pin?

Not sure what the advantage of using the esp32 for this is over a script on an android phone or something.

Why do they have different bootloader output? You did only app-flash?