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- Dial * # * # 3646633 # * # *
- Scroll right to the Hardware Testing page.
- Select Audio --> Volume --> Audio Playback.
- In the drop-down lists, set Default, Music and Speaker.
- Enter the values that you can see on my screenshot.
- Tap the SET button and your settings wiill be saved until the next factory data reset.
If you have the same volume issue in VoIP calls (Skype, Viber, WhatsApp, Google Duo etc.), you also can change the settings in the VoIP section.
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