oH!! thank god,I slove it in the end.
A couple solutions to possible causes:
On the original board 1. I replaced all the 100nf capacitors with 10uf (could be a current issue Don't really know but it works,maybe men who know can help explain)
2. still soldered falsely (USB differential circuits are ...

It is most definitely possible to burn a fresh chip over the usb pins, and if you hold down the boot pin, you should at least see it show up as a usb device when the device boots.
Comments on your design:
1) You are using pins that are already in use by the onboard flash. From the datasheet ...

Hey, I think the board or port is not fully installed on your PC. Have you checked the drivers?

Yes, my computer has the relevant drivers installed.

Thank you for your reply , ESP_Sprite

Here is my entire schematic:
607f1f72f545df9c4f7c76ed9dd13e4e.png

And my part of pcb (I am not sure it has some problem or not)
2ab9be0c1d054b565b00f561bddbe643.png

There's nothing wrong with the power supply. I tested it with a multimeter.And the CHIP_EN ...

Hello everyone, I get a tough problem.I am a newbie of esp32 so this problem has been bothering me for a long time.

The situation is: I drew a board with esp32c3(the chip is purely new),and only use USB(have no uart in my board,only usb) to load my code,no uart was used.Then I hooked it up to the ...