[Q] Restart local repo? topic

Hi! I have a problem.

I downloaded the android sources with repo init -u etc etc and then downloaded for a looooong time...
I modified the files and now I need to "restore" the sources to the initial repository...
How I can do that? Without remove .repo/ folder and re-download, because I have a very slowly internet connection...

Thanks in advance!!


p.d.: Sorry for my bad english...