I just checked out master with repo. Now I want to switch to froyo. How can I do this without downloading a bunch of stuff again? I don\'t want to download a bunch of stuff agai
if the branch you are in and the branch you will switch to has the same manifest.xml file, then you can use the following commands to do that.
repo forall -c git fetch aosp --tags
repo forall -c git checkout -b john5.1.1_r14_api22 android-5.1.1_r14
also see details in http://johnliao52.github.io/2016/03/27/git-repo-skills.html