Reimaging the SD card will probably bring it back to live. To do this, have a look at
https://www.mobileread.com/forums/sho...d.php?t=209122. That is I guide to put a larger SD card in the Glo, but the steps are basically the same. Except that you should skip step 2. If there is anything you don't understand, ask and someone will answer. There are also several other threads about this, that was just the first one I found.