На D-Link DIR-815 (пробил по 3wifi) не получается получить пароль (имея валидный пин)

[+] Sending M2 message

[+] Received M3 message

[+] Sending M4 message

[+] Received WSC NACK

[+] Sending WSC NACK

[+] Quitting after 1 crack attempts

[-] Failed to recover WPA key
[*] String pin was specified, nothing to save.

В чём проблема может быть?