You might want to post your question in the Kobo ereaders not the Kobo Tablets subforum.
Have you tried a factory reset? For the Glo, use the following procedure:
- Turn off your eReader. Slide and hold the power button for 20-30 seconds to force a power off. Remove any external uSD.
- Press and hold the light button.
- Continue to hold the light button and slide the power button to the right to turn on your Glo. You may have to do this a couple of times.
- Continue holding the light button and wait until the power light blinks rapidly (discoing).
- Wait for the factory restore to finish.
If this doesn't work, it's likely your internal uSD card is failing. See the
Memory Upgrade Mod Guide (With Pictures) for information on opening your Glo. You will likely need an image of the uSD card to copy over. You can ask for this in the
Kobo Glo IMG Needed thread (there are quite a few threads for different devices so best to stick to a device specific thread).