ESP32 Forum

Hello,

I found a problem that when I install a fresh module of ESP32-WROOM-32E in the system, I could not flash it using JTAG (Tool - ESP-PROG) at the very first time.

If I program any code using the USB to UART flash mode on a fresh new module, I could program with the JTAG after that. I have tried making the module empty after flashing via USB to UART and tried JTAG, there is no problem at all.

I have tried this with 3 modules are same.

Any suggestion? In production it is difficult for flashing each chip using USB to UART and then use JTAG.

Not sure... possibly there's some code in these modules that re-uses the GPIOs? Also, can I ask why do you want to use JTAG to flash these modules instead of simply using serial in the first place?

Well,

I figured out the Problem. The JTAG is used by the pre installed command line code. By making it empty or flashing with something else, it frees the pins.