Did you place the KoboRoot.tgz file in the ".kobo" directory? Then safely eject your Glo from your PC? Did you see the Glo display an "Updating" message?
Do you have KoboLauncher or fmon installed as well?
https://www.mobileread.com/forums/sho...d.php?t=201632
What happens when you use the home icon in the dropdown menu, (poke the "File Manager" text)?
Luck;
Ken