ESP32-WROOM-32E not programming using JTAG for the fresh new chip

[papaisou11]

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.

[ESP_Sprite]

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?

[papaisou11]

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.