ZTE Axon 7 eu version A2017G
On marshmallow pwamp 703 worked fine with hi-res audio
on 7 nougat pwamp 704 worked but after 7.1.1, with 704 i can see the option on the settings and can enable it, but on some random occasions when i press play i get the message Failed: hi res audio, using default
EDIT: Just updated to build V 1.2.0 b4 (7.1.1 always) still getting " Failed: Poweramp Hi res exp output. Using default output instead'