Hello,
You need to write good port COM number in window.
When go ti bootloader mode, GHL Communication COM port is replaced by USBVCOM COM port.
USBVCOM COM port number is nor same as usual COM port.
For that you need to watch in Device Manager.
Our KB article:
https://www.aquariumcomputer.com/kno...oser-firmware/
Also USBVCOM must be OK in device manager:
Gaël




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