Xperia z4 tablet and Sony PHA-1A portable headphone amplifier fix

[MoonMan]

Is Sony going to release a fix in a future Firmware so that the XPERIA Z4 tablet recognizes the Sony PHA-1A portable headphone amplifier? It is a simple fix requiring USB audio option listed.  It works just fine with Xperia z3 tablet but in z4 USB audio option not avaliable. 

[Uliwooly]

@MoonMan

This is a user based forum, no one can answer such question.