Frans Hettinga

I'm trying to use a USB disk to boot from, can i use this guide: https://raymii.org/s/tutorials/Netboot_PXE_Armbian_on_an_Orange_Pi_Zero_3_from_SPI_with_NFS_root_filesystem.html And after the "flashrom -p linux_spi:dev=/dev/spidev0.0 -w spi.img" insert the usb drive with armbian on it? Or are there any other steps that need to be done?