Firstly, the Glo HD does not have a "factory reset" button. That button is a simple reset button and only does something if the device is running and has hung.
Have you tried an actual factory reset using the last set of instructions on
https://wiki.mobileread.com/wiki/Kobo_Reset:_Glo_HD?
And if that doesn't work, I have sent a PM with the link to an image.