Try to flash the wifi fix aka non-hlos for fnb8 mate. Try to download and extract this file and flash it via odin by selecting Phone/CP (.Tar) " Remember to manually turn off your phone and wait atleast 10 sec then boot into downloadmode.
Edited: Links ready. instead saying thanks , please feel free to Click the thanks button>
Sent from Hell ��
1. I recommend u do a FACTORY RESET (remember make a backup of ur data folders and SMS before do this process). You will recover the sound maybe. If that no works continue with next step.
2. Full wipe (You can do this in CUSTOM RECOVERY or STOCK RECOVERY).
3. Flash again android 4.4.2 stock rom .
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