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I suspect you've run afoul of the same bug that was briefly introduced in a recent firmware update, which was quickly fixed but stills afflicted many.
What you can do
1) your Kobo is still working the screen is just black. If you connect it to a computer and tap from about an inch up on the right hand side you should eventually hit the 'connect' button and can then side load a fixed firmware update. This can be found in the current stickied instructions for patching firmware 4.4.xx post.
2) you can factory reset your Kobo. This will erase everything on the device and roll back to whatever firmware it had started on. You can then update to the most recent firmware safely
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