Used esp32 pico v3 , designed own pcb , but failed to show on device manager

[XUEZHI]

Not exactly sure if this is would cause failure to enumerate (I use the QFN24 version, with the VIO pin) but it appears RSTb should be tied to VDD not VBUS.

2.1 Power
In all cases, a 1 kΩ pull-up on the RSTb pin is recommended. This pull-up should be tied to VIO on devices that have it. On devices
where VIO is connected to VDD or devices that do not have VIO, this pull-up should be tied to VDD. The RSTb pin will be driven low
during power-on and power failure reset events.

so it should be a 3.3v not a 5v , also i may put resistor value too large? but i dnt think it will totally shut down the CP2102

[XUEZHI]

Check VDD on the CP2102N

cp2102n should connect to VDD is it？ should not connect to VBUS? maybe thats why my board not working?

[XUEZHI]

I only put power on VBUS but i didnt put for VDD....
My mistake ...
Now it shows on device manager , but still cannot load firmware, should be some other problem

[captain_morgan]

I'm not sure what exactly you did next but you should know the CP2102N has two power modes. Bus powered is where VBUS is attached to VREGIN like you have. In this case VDD become a 3.3 volt OUTPUT and should not also have VBUS connected to it. My prior suggestion was connecting RSTb to VDD