Huawei GT3 NMO-L31 has been upgraded to B171 in middle eastern regions. users with cust number c185 can use this firmware to update their phone. following is official changelog.

Update Features

This update adds a feature enabling you to move incoming calls to the background, a hi-fi note sharing feature, and optimizes the screen brightness adjustment feature.

[What’s new]

• Added a feature, enabling you to move incoming calls to the background by touching the recents button when it is inconvenient for you to receive a call. You can reaccess the call from the notifications panel.
• Added a feature, which automatically adds a new homescreen or deletes an empty one when you move app icons.
• Added a feature, which adds Email events to calendar events automatically, enabling you to add calendar events through Email.
• Added a feature, enabling you to share access to a Wi-Fi connection through QR codes.
• Added a feature, which shows the number of devices connected to your Wi-Fi hotspot in the status bar.
• Added a feature, enabling you to hide the floating dock in HiGame.

[Optimizations]

• Optimized the screen brightness adjustment feature in the shortcuts panel, enabling you to adjust the screen brightness from the current screen by dragging the slider.
• Improved device security with Google security patches.

Huawei GT3 Firmware B171

• Download Link  : Huawei Server Link 
• Data File Download Link : update_data_full_hw_meafnaf.zip
• File Size : 1.50 GB & 189 MB
• Both files in one Link : NMO-L31C185B171_GT3_Middle East.zip
• Supported Models : NMO-L31C185 (Middle East /Africa)
• Firmware Type : OTA Full Firmware

Installation Guide

• You must be running B130 Firmware.
• Your phone should not be rooted and have stock recovery.
• Backup important data
• Battery should be 60% charged
• Make dload folder on sd card /internal storage
• Copy update_data_full_hw_meafnaf.zip to dload folder
• Extract downloaded update.zip file and copy update.app to dload folder.
• switch off phone and press 3 buttons (volume up, volume down, power) keep them pressed untill update should start.
• After installation phone may take 10 minutes to start 1st time.