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I managed to repair the touchscreen in version A. I took apart the entire reader, removed the motherboard and detached the front frame. Then I cleaned the entire screen with a microfibre cloth and isopropanol, thoroughly cleaning the edges of the screen and touch panel with a cotton bud dipped in isopropanol. Then I covered a part of the screen with ordinary office tape so that the tape covered the edge of the touch panel and did not overlap the touch layer or extend beyond the frame. I have been testing the reader for several hours and there has not been a single case of ghost touch.
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