my problem was the firmware.
i have B315s-607 Vividwiress (Australia) which was network locked.
but i managed to flash a universal firmware on it and then added the Openvpn by Jerome Laliag. it works great
* RESTORING NVRAM AND DEVICE INFORMATION
1. Make sure connected ang modem via LAN or WLAN at make sure na modem na B31s-936 nyo lang ang nakaconnect.
2. Open B315s-936 NVRAM Writer.exe then wait nyo lang mag restore ang nvram at hintayin lumabas ang NVRAM Writer.
3. Then input nyo lang ang device information nyo, nakalagay naman dun kung ano ang need.