![COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center](https://support.arduino.cc/hc/article_attachments/360016531980/COM_port_changes_3.png)
COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center
![Change USB COM port description of the "Arduino UNO R3" [SOLVED] - Programming Questions - Arduino Forum Change USB COM port description of the "Arduino UNO R3" [SOLVED] - Programming Questions - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/5/0/a/50a83241149d098df623ec267187dd2150da256a.jpeg)
Change USB COM port description of the "Arduino UNO R3" [SOLVED] - Programming Questions - Arduino Forum
![COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center](https://support.arduino.cc/hc/article_attachments/360016532000/COM_port_changes_2.png)
COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center
![USB to TTL PL2303HX Module Serial Port Downloader Module KEYES for Arduino - products that work with official Arduino boards USB to TTL PL2303HX Module Serial Port Downloader Module KEYES for Arduino - products that work with official Arduino boards](https://www.elecbee.com/image/cache/catalog/Converter-Board/USB-to-TTL-PL2303HX-Module-Serial-Port-Downloader-Module-KEYES-for-Arduino---products-that-work-with-1400915-7617-500x500.jpeg)