Are MISO and SD2 nets connected? I see a pull up resistor on one of them, and a pull down on another, and both names are near MTDI pin of the chip... But that would only affect flash voltage selection. You should still see ROM bootloader output even if flash is not readable, provided that MTDO is p...

ESP32, just like the ESP8266, has bootloader present in mask ROM, so there I no need to burn anything. Would you mind posting your schematic so that we can check the way the chip is bootstrapped? ESP32 has a feature that one of the pins can be used to disable UART output at boot time. Hi ESP_igrr, ...

A newbie here on ESP32, but has quite many experience with ESP8266. Forgive for newbie question. I have some esp32 bare chips. Made a PCB and soldered those 48 pins of QFN and supporting components. The question is then what? I tried to connect UART with USB to Serial module, and nothing appear. Fro...