The pepe2k site is not the place to get GL-inet uboot. The switch command was something GL put into their version. Please see my post here:
And the next few comments. To get into uboot http server, hold the reset while powering on (or uboot rebooting) it will flash 5 times then release the lights should all flash and uboot will start http.
see:
If you are in uboot console you can just run http and it will start it (ctrl-c to quit)
to get the uboot version run ‘version’ – see the uboot manual:
The U-Boot Documentation — Das U-Boot unknown version documentation.