There are no extensions to Busybox in 3c - try chown --help
I think that perhaps the problem is the memory stick - if you can get just the 3c hdf to flash - END diaplayed then wait for shutdown and reboot - then try and copy both the installers for the packages you want and ALL the unistallers to the stick.
Then insert the stick but do not press anything - the files should be processed and the HDR should reboot - check the files have been deleted.