Huawei‘s B890 WebCube (Gateway) is unlockable. I have already unlocked B890-75 Drei (3) web cube of Austria using FMC unlocker. But, Zain and another carrier B890-75 comes with customized firmware and it does not accept the unlock code. Also, the latest firmware of B890 does not accept the SIMlock code. May be, this firmware will be able to unlock your B890-75 of Zain carrier, however, we have personally not tested and I am not responsible for any harm of your device.
In this post, I will share the instruction of firmware updating and download link of firmware (link is provided at the end of the article).
How to Change / Flash the Firmware of Huawei B890 WebCube (Gateway) ?
1. Download the firmware update from the link.
2. Now double click on the downloaded file to run it.
5. Once the update is complete, the WebCube will restart. Modules which is compatible with your device will be updated, and which are not compatible will be not updated in this processes and will be unchanged.
Note : Firmware update is risky and it may corrupt your device. Do it at your own risk. Also, before starting the process, make sure your device and laptop are connected to constant power supply / UPS.
Firmware of Router Module Version: 1281.11.03.09.127sp02
Firmware of Wireless Module Version: 1281.11.03.08.122sp08