I have changed network card with help of service people....It started detecting the devices but still not able to stay connected with bluetooth services like file transfer, Internet etc.
It seems the this inspiron 3521 version all laptops having issue with Bluetooth. Otherwise system is perfect for general use. Dell need to look into this OR delete the bluetooth feature itself from specification. So bluetooth users will go for other dell models.
I still believe in DELL and I have Dell vostro, Dell MINI with me. They are working up to the expectations, much robust design and with good backup.
So, request to Dell that please do not disappoint your customers with such issues.
Thank you,
Regards.