Programming issue HP41CX

[damaltor]

borrow a second card reader, maybe the cards can be read then.

i had a problem with my card reader a while ago that allowed me to write cards, and re-read those freshly written cards, but i was unable to read older cards which worked fine earlier.

the problem was that the card was pulled through in the wrong speed. after fixing the card reader, it could read the older cards again. maybe your card reader simply is not working anymore, and a second one will read the cards just fine.