QMobile Noir i6 Smartphone Software Installation

I have QMobile Noir i6 Smartphone. But since last couple of days when I switch on of my Phone, Phone hangs/freeze after QMobile welcome screen. Its not proceeding any further process. Now I want to again install QMobile Noir i6 OS.
Could any one help me about this issue.
How to install fresh Software in my QMobile Noir i6. Descriptive and complete process?
Where to download software for installation.
Thanks and kind regards