Not all Android smartphones have the speaker quality or volume level you want. Similarly, not all Android smartphones have a good headphone jack, and some are even lower than usual. If you are a user Huawei P9 Lite living in Europe may also be true for your device. If you have ever wondered why your Huawei P9 Lite has low audio output through the headphone jack, the reason is EU. The EU sets a regulatory limit for Huawei P9 Lite only sold in the European market. But when you are in a crowded place, it becomes difficult to hear it because of the noise from outside. Fortunately, there is a way to increase the headphone volume on the Huawei P9 Lite.
This method was first described by XDA dev Paolo83. Unfortunately, for some of you, it requires the Huawei P9 Lite to be rooted from above firmware version B370/B380. In case you want to root your device now, we have you covered. Click this link for instructions of rooting Huawei P9 Lite.
Warning: Xiandroid blog is not responsible for your device. Rooting also means that the device is no longer under warranty, so you need to proceed carefully every step of the way.
- Root Huawei P9 Lite running firmware B370/B380.
- Install File explorer app on your device.
Open File Explorer
Launch your File explorer of choice. Some of the browsers that can use the popular ones are ES File Explorer, Solid Explorer, Root Explorer… If you use ES File Explorer, be sure to mount the system partition as Read and Write ( RW ). To do this, open the list and in the Tools, tap option Root Explorer. Choose Mount R / W on the pop-up dialog that appears and set the system partition as RW.
On Root Explorer, just go to the system folder and click on Mount R / W above.
Headphone volume up
Now navigate to the directory /product/etc/audio/hi6402mixer_volumes ### and find the file named mixer_volumes_VENUS_ce . For dual sim devices, the file is named mixer_volumes_VENUS2_ce. Before we make any changes, you should make a backup copy. So copy the file, and paste it in a different location. Rename the file to mixer_volumes_VENUS2_ce.bak and then move it back to the root directory.
Everything you do right can proceed to delete the .bak file from TWRP.
Find the file and open it with a text editor. Most File explorers come with a built-in text editor. On Root Explorer, if you click on the file, it will simply open as a read-only file. To be able to edit the file, long press the file, click the three-point menu button in the upper right and select Open with . Now choose Text Editor from different options. This is probably to make sure you don’t accidentally open and edit content you don’t understand or intend.
In the file, scroll down until you find the following lines of text.
Here, the values we are interested in are HPL PGA GAIN and HPR PGA GAIN. Change these values from 10 to something a bit higher like 20 or 15, depending on how loud you want the sound to be. 28 is also an acceptable value but be aware that values above 20 are quite loud and can damage your ears at maximum volume. Anything over 20 is not recommended if you regularly listen to music for long periods of time.
Just to remind you again, this is a core system file so don’t make any other changes unless you are sure of what you are doing. When you’re done, save the file and reboot your device. On startup you should be able to notice a difference in headphone volume from now on.