The tutorial has a minor error in that the command "nvram export —set >config.txt" contains dashes (Microsoft Word style) that should be hyphens i.e.
nvram export —set >config.txt
More significantly, when I tried "nvram import config.txt" on an Asus RT-N16 with Shibby's AIO 109 nothing seemed to happen. Result counts were all zero.
But the text file contains a whole series of nvram commands. It was possible to make it executable with "chmod +x config.txt" and then to execute it with "./config.txt". The result will be temporary unless a further command is run: "nvram commit". After that, reboot and the transferred configuration is effective.