In this post you will get a huge list of firmware and web UI (software) which is related to Huawei E5375. Firmware may ask you for password, which you can get free by commenting below. For webUI change, there is no need of any password. If want unlock code then charge is only 6 USD, which you can pay through paypal button of this site.
If you have any another firmware, let me know via comments, i will upload it.