I've fixed it! The solder didn't reach, which caused the crystal not to work. I didn't think it would be this issue. I tried reflowing again and added more solder.

There is one SOC that works. I bought a new ESP32 SOC and tried it with the same circuit design, but it didn’t work. I tried measuring the crystal, but there was no signal, and there was no current or voltage. Is it possible that the problem is caused by the crystal?

crystal i use
https://lcsc.com ...

Initially, I received the message 'Unknown USB Device (Device Descriptor Request Failed)'. At that time, I was using a C17 capacitor marked as 10uF. However, when I measured the actual value, I found it to be 7.4uF because the capacitor I purchased had a tolerance of ±20%. After the 10uF capacitor I ...

I'm using an external 3.3V power supply instead, for easier debugging. And regarding the USB OTG not working, do I need to set up USB CDC first?

I removed the U12 IC and reconnected the board to my computer. It was detected, but it appears there's no driver support, as it came up as 'Unknown USB Device (Device Descriptor Request Failed)'. After a while, I tried connecting it again, but this time, no notification appeared at all.

I don't ...

I'm having trouble with USB OTG. I've designed and built the circuit, but when I connect it to my PC, it's completely unresponsive, even after trying to enter bootloader mode. You can see the circuit diagram below.

esp32s3
Screenshot 2025-05-24 082048.png
BQ25601DRTWR
Screenshot 2025-05-24 ...

By default, all those eFuses are 0 so GPIO3 is ignored wrt configuring USB-serial-jtag, so you're free to use it for whatever.

Thank you very much. I have been wondering for days.

I'm a beginner and I want to know if using sar_i2c_sda_1 and i2c on GPIO3 will affect the usage of the USB Serial/JTAG Controller?

According to the topic, when using the USB Serial/JTAG Controller for code uploading and serial output, will there be any impact if I only use the USB D- and D+ for ...