No COM port available

PKewin
Posts: 1
Joined: Mon Apr 13, 2026 6:14 pm

No COM port available

Postby PKewin » Mon Apr 13, 2026 6:24 pm

I am using a Windows 11 laptop. I have connected to several ESP boards using IDE without a problem. Recently my laptop refuses to recognize any ESP board and IDE shows no, ports available. This just happened in the last couple of days. I’ve spent hours troubleshooting windows, security, power, settings, cables, etc. I have reinstalled the serial Driver and nothing seems to help. Has anyone else experienced that?

lbernstone
Posts: 1133
Joined: Mon Jul 22, 2019 3:20 pm

Re: No COM port available

Postby lbernstone » Tue Apr 14, 2026 8:21 pm

Hold down the boot button when you plug them into the PC.
If the device doesn't have a UART->USB adapter on board (eg CP2102), you need to set the serial console to use USB-CDC

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