Dear All,

I need to update the firmware of a fan for the RPi4 and given the below
instructions in Raspbian. I also installed

sudo dnf -y install i2c-tools
sudo dnf -y install python3-i2c-tools

but the firmware update fails. I guess, it is because of the serial port
not being enabled. Any advice?

Thanks, Thomas

In order to use bootloader, user need to have activated and free Serial
Port on Raspberry Pi®. The below
procedure is showing how to make sure that Serial Port is free and
available for Bootloader process.
sudo raspi-config
Select -> Interfacing Options
1. IC Kernel ON
2. Serial option to enable UART
Then it will ask for login shell to be accessible over Serial, select No
shown as follows.
At the end, it will ask for enabling Hardware Serial port, select Yes,
Then, reboot the Raspberry Pi®!!
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