I won't believe that Message #2 Posted by Frank Boehm (Germany) on 27 Feb 2009, 4:07 a.m., in response to message #1 by Marcus von Cube, Germany
Using a module is the way to go, I don't believe HP ever made a calculator with a modified internal ROM. So either they are plain broken or the seller doesn't know how to use them (which is somewhat more likely in this case).
Judging by the images, there seems to be remains of a water/dustproof overlay on top of the calculator, I'd certainly ask if these remains are removable or if they are glued onto the calculator.
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