I'm not sure what your issue was, but if you want to delete the downloaded update then boot into recovery mode by holding L, R, Up and A on boot and then cancel out of it. You can update to the latest firmware with B9S and Luma though.
Ok, I do that and get updated to 11.6.
Found out the same thing happened with the Wii U. It was on 5.5.1, now it's on 5.5.2.
I guess dont know why the DNS settings failed on both units.