Response Data format:
This must be implemented even if Credential and/or Key management is not implemented. If the PIN/PUK retry count is not available or is not applicable, its value should be set to 0xff.
Before 4.0, P1 = 0x01 returned the current key path as a sequence of 32-bit numbers, empty when the master key was selected. There is no current key path anymore as every SIGN and EXPORT KEY carries its own path, so P1 = 0x01 now returns 0x6A86.