Seeing Wi-Fi password on Android 6.0/EMUI 4.0
Simply back up your Wi-Fi settings using Huawei Backup application.


Save the backup to SD card 
Navigate to this folder: /sdcard/HuaweiBackup/backupFiles/xxxxxxx/wifiConfig.db (where xxxxxxx is a folder with a date on which backup was performed.
Using a file manager open the file wifiConfig.db as text (you need a text reader here try RB text editor -works even if not rooted)
In that .db file there is a list of wireless SSIDs with thier corresponding passwords and choose the one you wish to know the password an you are done.