Ender 3 marlin UPG with arduino nano?

#1

Hello all I would like to know if you have done any firmware update with areduino nano. I’m trying but

in Windows 10 I can’t pass from create arduino ISP error: ser_open(): can’t set com-state for “\.\COM4”

In Mac OS
Error: could not find USBtiny device (0x2341/0x49) when trying to upload marlin firmware or bootloader

Any idea what is missing?

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