@Sunshine Thanks for the resposne. 1. My ISP: Navkar Supertech Pvt Ltd 2. Yes, the replaced refurbished router is a C80 V 2.20 and the refurbished one has no issues but the one I had before that had...

I've tried to contact the technical support in every possible way (Live Chat Support, Phone Call Support, Email Support, and etc). but no one is answering calls or replying to the emails I sent....