Yeah, maybe. I did this hacking with a coffee card. I find an android app that can get the image with nfs, and I was able to make the same image, and in this situation, the machine send back an information to lower the money on my card. In this situation, all I need to do was to reload the initial image with money on it.
The problem is that this must be more difficult, and they can easily detect a strange behavior on your account.
My advice will be at first to flash your card, and try to open the metro gateway with that, and I think your account will still be credited...
Wait can you show pictures of this?
Well, no, it was some times ago. Your first step is to be able to read your card as nfc with an appli (you can try on a lot of thing, like my access badge to enter my building can be opened from an appli) Then, try to see what happend if you try to use your phone to enter the subway (this should work, but your card will probably still increase your tickets)....
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