In order to fix the issue, download and install the Mobile Partner for your device model from the official web page. After that, try updating again its firmware. If it doesn't work, use Google Search Engine to find Huawei Modem Unlocker software, install it on your computer and plug in the modem. Launch the program, click the Refresh button, check the Auto Unlock Modem and Auto Calc Code boxes and press READ MDM DATA. After that, click UNLOCK and your modem should be repaired. If you still have issues, I suggest you contact the Huawei Support Team.