The ESP32 Dev circuit has 2@ 2N2222 that can be used to drive EN and IO-0. Under what circumstances are these required/activated?

I am building my own PCB using the EPS32-WROOM module and wonder if I need the 2N2222s. My preference would be to use the common little module with a CP2102 and a 6 pin ...

I've not seen this concisely written in one place, so here goes:

1. Prerequisites
In the IDE:
Select the proper PORT
Set baud rate 115600 <--- this may change if you change ports
Select the "ESP32 Dev Board"

1.1 Ensure IO-2 is Grounded.
IO-2 must be low to enter bootloader. By default it is ...

hi username

Great image for the sequencing of EN and GPIO-0.
When does the uploading occur and when do I release EN?

thanks
Barry
love the creative account name too!