Looking at that screen, it appears that your Aura H2O ed. 2 has frozen in the middle of a firmware update. Not good news.
Have you tried holding the power button for ~20-30 seconds to force your Kobo to turn off, releasing the power button and then pressing it again to try to power on your Kobo.
If that doesn't work, you could try a manual factory reset See
Manual reset your Kobo Aura H2O Edition 2 for the procedure.
You will probably need to disregard the part about waiting for the Power Off screen in step 2. Just hold the power button for about 30 seconds to force your Kobo to power off and then move on to step 3.
Good luck!