Unfortunately I found by the hard way that when the InkPad 3 Pro is in a loop or failed boot, there's not way or key combination to hard reset it. The only way is careful open it and disconnect the battery, so it will restart by itself, delete damaged firmware file from the InkPad and let it to update itself.
I wish the guys at PocketBook will provide their devices with a hard reset option using a key combination or similar.
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