What can I do at this situation?

[MD:Muhi-Uddin Zihad]

I only renamed build.prop as build1.prop. Now my phone isn't booting. What can I do at this situation?

 

[Almeuit]

You may have to do a full reset.

 

[Muhi Uddin]

But how will I do this?
And I don't want to lose any of my data.

 

[olegoil]

so make first backup

 

[Muhi Uddin]

How to make a first backup.