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COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center
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Usb To Rs232 Com Port Serial Db9 Pin Cable Prolific Cp2102 Pl2303 Ftdi Null Modem Dce Crossed Wired Adapter Cable Rs232 Com 6ft - Pc Hardware Cables & Adapters - AliExpress
![How to change the COM port for a USB Serial adapter on Windows 7, 8, 8.1, and 10 - Plugable Knowledge Base How to change the COM port for a USB Serial adapter on Windows 7, 8, 8.1, and 10 - Plugable Knowledge Base](https://media.plugable.com/images/kb/714099/set-com-windows-005-max.png)
How to change the COM port for a USB Serial adapter on Windows 7, 8, 8.1, and 10 - Plugable Knowledge Base
![Fixing motherboard COM port dongles « Adafruit Industries – Makers, hackers, artists, designers and engineers! Fixing motherboard COM port dongles « Adafruit Industries – Makers, hackers, artists, designers and engineers!](https://cdn-blog.adafruit.com/uploads/2009/11/mboardcom.jpg)