I'd be tempted to try a few things.
First would be to get a brand new SD card, and try installing the Glo HD f/w on it.
Second would involve some linux knowledge but would be to take a backup of the internal SD card, and then, mount the file systems and take a look through the Kobo root file system and see what changes were made by the XCSoar installation, especially at the init scripts and any other startup scripts. Remove as many of those changes as possible (using as a guide those scripts etc found in the f/w download applicable to your device).
Once as many changes as you can were reverted, try rebooting the Kobo; if it works do a factory reset (and once that is done, make an image backup and send it to Davidfor)!
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