I found this in the Xperia Z1 forum... it should work on the ZU as internally they are identical...
This is not my work, and credit goes to @ZeroInfinity
-For a Sony ROM
Increased internal/ external speaker, headphone volume, volume call speaker
1 - Copy .zip to ext sdcard
2 - Enter CWM
3 - Install mod
4 - Reboot system
5 - Enjoy
Download Links:
Increase Volume:
http://d-h.st/UE9
Revert back to stock:
http://d-h.st/U5k
I flashed this to the 257 firmware. Yes I have a considerably louder internal speaker output but my phone no longer recognises anything I plug into the 3.5 jack and just continues to play sound from the speaker. I do use viper audio v4a. Could this be the cause of my problem?
I tried flashing revert back to stock and it hasn't solved the problem :/
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