ESP_Sprite, indeed, the problem was the solder joints on the QFN package.
The project was changed to add the 1uF capacitor that you (and the datasheet) suggested.
Thank you very much!

Hi, I've designed a custom ESP32 board based on WROOM-32 module for home applications. However, I am not able to flash it. The board can send data through UART (as shown below) but cannot receive the flash data. When trying to flash, I get the following error: Download mode successfully detected, bu...

It was sheer stupidity.
The FTDI board had its jumper set to 5V; setting to 3.3V solved the problem.
Being dumb is hard, kids.

It's interesting though that the board was able to deliver 5V while connected using USB.

Thanks everyone.

I've tried with the defaults one for both UART0 (rx0, tx0) and UART2 (rx2, tx2), neither worked.
Should it happen only to UART0 or both?

I'll let you know if changing to other pins works.

Thanks!

Hi, I'm using 5 ADCs (32, 35, 34, VN, VP), 3 outputs (18, 19, 21) and UART2 (RX2, TX2). The logic driving the ADCs and outputs works fine on VIN but I got nothing on the UART. When powered through USB everything works fine. I've tried (with no luck): * UART0 and UART2. * Connecting VIN to 9V. * Disc...