день добрый
как прошиваются телефоны cisco spa50x-30x-7-6-2a-recovery
или  по инструкции с пришивальщика

You must provide the SPA administrator's
password to upgrade. If you are the administrator
and forgot the password, you may perform a
factory reset by entering * * * *, option 73738#,
and value 1 from a telephone connected to the
unit to be upgraded.

спасибо.