Fix Huawei P20, P20 Pro, Mate 10 Pro Volume issues

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I have just received my Huawei P20 Pro, the volume using wired audio devices is quieter than I would like. I have looked online for a fix and have found that it is software related and can be fixed in a software update. i have also found that other Huawei and those of sister company Honor device users are also having this issue. 

I am currently in talks with Huawei about this getting resolved without the need to root our phones!

here are forum links to reports (and some the fixes):

Honor 7:
Honor 8:
Honor 9:
Huawei P8 Lite:
Huawei P8:
Huawei P9 Lite:
Huawei Mate 10 Pro:
Huawei P20 Pro:

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