if you have lost IMEI of your Huawei 3g/4G modem during downgrade or unlock process, or IMEI is showing 0000000000000. its very easy to fix by following tutorial.

Huawei Modem IMEI Fix

How to repair IMEI

• Install DC-unlocker software, and create free account , don’t buy credits
• Modem must be connected in download mode (use google to search your model download mode method)
• Make sure all drivers related to modem are installed, not missing a single one.
• Open DC unlocker and let it auto detect modem by hitting magnifying mirror icon.
• Once dc unlocker finished reading data of your modem note down correct IMEI number written on box or modem sticker.
• Then type this command  AT^CIMEI=”xxxxxxxxxxxxxxx″
• where xxxx is your IMEI, then press enter, after that restart modem. and read data with dc unlocker. your IMEI will be restored.