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One thing: by the "same error" I mean a completely inoperable touch screen as the original topic description.
I've never seen an error like yours, especially not two in one household. And I'm sure it's not a hardware fault. Maybe firmware/software, but twice...? If it is used from usb then maybe there is some conversion error or similar in your books. I've seen some like this, a bad book file can make interesting things. I can't imagine anything else at this time.
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