1. Ulefone Vienna (Gotron GQ3028AF2 )
2. Android 6.0, 64Bit MTK MT6753, 8 cores, 1.3 HHz CPU, stock ROM by Ulefone ( ROM Ulefone Vienna version: F5B_GQ3028AF2_13E_MM_VIENNA_20160830 – full_wtk6753_65u_m0-user 6.0 MRA58K )
3. It uses internal Smart Audio PA DAC & amplifier chipset by NXP.
audio_policy.conf