Complete Guide to Unlocking the Huawei E5577s-932: Firmware & Unlock File Solutions
Each E5577S-932 has a counter (usually 3 or 10 attempts). If you or a previous owner entered wrong codes repeatedly, the device enters a state where it no longer accepts code entries. The web interface simply shows "SIM Locked" with no input field. A firmware unlock file bypasses this counter. e5577s-932 unlock file
(Paid, but reliable)