Except the current 4.0.7523 firmware that's out right now is for Mark 6 devices, and it wasn't even officially released for older hardware like the Glo HD (it's mainly for the Aura One). And it's already been confirmed to contain bugs, hence the delay in the firmware 4 general release. You might as well just wait it out until Kobo does the general release some time next week (hopefully).
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