In your case, you can use a professional data recovery tool to get back the lost and deleted data. There are many functional data recovery tools on the market, but we strongly recommend you to use the Android Data Recovery.
Android Data Recovery is the world's No.1 yet all-around data recovery and management program for almost all Android devices, whcih does not require complex operations, simple steps to retrieve deleted and lost data. It support for various models of Android devices, for example Samsung, Sony, HTC, LG, Sony, HUAWEI, ZTE, Motolora, OPPO, ViVo, OnePlus, Meizu, Xiaomi, etc.. It involves a wide range of data types, text messages, photos, videos, WhatsApp, audio, call history can be restored. What's more, it's 100% security, only you can access your account and files. Its recovery success rate of up to 99% and it is a reliable choice for millions of Android users.
Steps to Restore Deleted & Lost Data from Huawei nova/nova 2/nova 2 Plus
Connect Your HUAWEI nova/nova 2/nova 2 Plus
Please download and run Android Data Recovery on your computer. Its operating interface as shown below, select "Data Recovery". Then, use the USB cable to connect your HUAWEI nova/nova 2/nova 2 Plus to the computer. At the same time, you also need to open the USB debugging on your phone.
If your Android os version is 4.2.2 or above, there will be a pop up message on your Android phone, tap on OK to allow USB debugging.
Select file types to scan
Next, select the file you want to restore. By default, all files are checked. If you want to restore all data, you can directly click on "Next". And you can cancel the other items you do not need and click "Next".
Scan your device to find the lost data on it
As shown below, the program will provide two modes for you to choose, one is the standard mode, the other is the advanced mode. Please choose one according to your needs. Then, click on "Start". The program begins to analyze and scan your HUAWEI nova/nova 2/nova 2 Plus.
Note: There might be a Superuser authorization appearing on your device during the scan. If you get it, click "Allow" to confirm it. If not, just forget it.
Preview and restore data selectively
When the scan is completed, you can preview the found data one by one. Check whose whatever data you needed and click "Recover" to save them all on your computer.