Specialized function for restoring or repairing device identifiers.
The "zzkey" (specifically XTM_ZzKey ) is a Windows-based service software used by repair shops and advanced technicians for maintaining and repairing Nokia smartphones. Gsm_X_Team.
While "free download" links are common on forums, the original software from Gsm_X_Team often requires a physical USB "dongle" (smart card) for activation and legitimate use.