А вот еще информация от того же источника:

This errors happen in phones with FFFFF and after repair it. Sometimes everything is ok sometimes phone back to status before and SX4 auth can't be done.

As I think this error happens because PM308 contain not only simlock block but few others important blocks - bb5king can only repair and change one block other blocks can be damaged too so now I can say only - repair FFFF but some phones can't be repaired and have SX4 auth problem after this.

Restore backup and wait, or search for RPL.
Оригинал
Похоже главным критерием работоспособности телефона и исправности его security является прохождние SX4 авторизации.