Hi Nguyễn Hồng Quân Since you are trying to change the preferred language with a PUT DATA command I assume you are using an OpenPGP card
OpenPGP cards use ASCII coding of PINs so the correct APDU to verify your admin PIN (assuming its value is the default 12345678) is 00 20 00 83 08 31 32 33 34 35 36 37 38 How about using gnupg and the "gpg --card-edit" command? Would be much easier than using PUT DATA apdus in opensc-explorer. Peter
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