Huawei+modem+unlocker+v577+work -

The log window will display "Unlocking... OK" if successful. Common Troubleshooting

: If your carrier has installed "hard-locked" firmware, software unlockers may be blocked from writing to the device. How to Use Huawei Modem Unlocker huawei+modem+unlocker+v577+work

This is the most reliable software tool for modern Huawei modems. The log window will display "Unlocking

It can often provide a temporary unlock (until reboot) or a permanent one depending on the device model. 21.200 for E3372)

If you are technical, downgrade your modem to a vulnerable firmware version (e.g., 21.200 for E3372), then run V577. This works for many locked "HiLink" modems.

: The modem is connected to a PC via USB with the original SIM card removed or a "foreign" SIM inserted.