Samsung Galaxy Grand (SHV-E270K) wlan Problem

Hi,
i have Samsung Galaxy Grand (SHV-E270K). Some one give me a Ported rom for it. But only two bugs in it & need to solve.
1) Wifi is not working... (Which One files i should replace from Stock ROM)
2) Mic (output) Call Sound is very low.

Remember

ROM is from Project Dokdo & is Lollipop 5.1 same like Cyanogenmod 12.1
Exynos 4412
i have stock rom (4.1.2)

Please Guide me.
Thanks