About this component
Hold BOOT and tap EN to force download mode when automatic flashing fails. Espressif notes that capacitor C15 on early V4 boards can make the board enter download mode on its own, or upset the GPIO0 clock output; removing C15 is their suggested fix.
What it does on this board
Held at reset to enter the serial bootloader.
Pinout & readings
No pinout or reference readings yet — these show what each pin does and what a healthy part should measure.