The "-932" suffix denotes a specific hardware revision. Attempting to use an unlock file meant for the E5573 or E5577s-321 can your device.
In that case, you need a — a modified firmware package. Here’s how that works: e5577s-932 unlock file
If your carrier cannot assist, reputable third-party services can provide unlock codes. Ensure you research and choose a trustworthy service to avoid potential scams. The "-932" suffix denotes a specific hardware revision