These are the steps I use:

Initialize the BOOTP/DHCPD service:

$ cd max-os/tools/easy-bootp/
$ sudo python3 main.py -i enp0s31f6 -d /home/acassis/tftpboot

In the maxbox run the default u-boot command to flash the device:

=> run flash_max_os

That is it!

• BrainDamage