Also, note that in my schematic the VDD_SDIO is not connected to the memory chip. My board is now back to life: the solution was to change from a memory of 16MB to a memory of 4MB. Shouldn't the 16MB work just fine? (I am asking to know if it was a problem with the part number of that memory of 16MB...

VDD_SDIO keep HIGH all the time. The pin does not trigger the oscilloscope, steady at 3V3.

Hello, I've designed a custom board which uses the ESP32-D0WDQ6-V3 chip, as shown in the schematic below: ckt.png Note: the pins GPIO0 and CHIP_PU are being driven by a STM32. The STM32 reads the pins of a nodemcu dev board and mirror these pins states into the GPIO0 and CHIP_PU to program the ESP3...