This is a set of instructions that will allow you to reset your ykneo-openpgp applet.
For this procedure, you must have GnuPG version 2.0.22 or later and ykneo-openpgp applet version 1.0.6 or later installed. To check the applet version run the following.
gpg2 --version ... gpg-connect-agent --hex "scd apdu 00 f1 00 00" /bye D[0000] 01 00 06 90 00 ..... OK
The string "01 00 06" means version 1.0.6.
The reset procedure consists of two parts.
First, the card is locked by entering the wrong PIN and Admin PIN multiple times.
C:\Users\Foo>gpg-connect-agent --hex > scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40 D[0000] 63 C2 c. OK > scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40 D[0000] 63 C1 c. OK > scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40 D[0000] 63 C0 c. OK > scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40 D[0000] 63 C0 c. OK > scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40 D[0000] 63 C2 c. OK > scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40 D[0000] 63 C1 c. OK > scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40 D[0000] 63 C0 c. OK scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40 D[0000] 63 C0 c. OK
Make sure the response goes down to C0, indicating zero remaining retries for that PIN.
Then, the card is terminated and reactivated as follows.
> scd apdu 00 e6 00 00 D[0000] 90 00 .. OK > scd apdu 00 44 00 00 D[0000] 90 00 .. OK
After this, close the connection, remove the card and reinsert it again. The applet should be reset.
To make things easier you may want to create a script. To do so, put the following into a script file and run it using gpg-connect-agent (gpg-connect-agent -r FILE).
/hex scd serialno scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40 scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40 scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40 scd apdu 00 20 00 81 08 40 40 40 40 40 40 40 40 scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40 scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40 scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40 scd apdu 00 20 00 83 08 40 40 40 40 40 40 40 40 scd apdu 00 e6 00 00 scd apdu 00 44 00 00 /echo Card has been successfully reset.