I have inherited some code (from zip file) from a developer and git initialzed, made changes and set of check-ins progressively. Now, the same developer released the same code with his changes and gave me the another zip file. How do i merge my changes which i have it my git repo and his recent changes from the second zip file contents? Ideally, i would like to have the code which should be accumalation of both my changes and the developer recent changes. I tried to create branch b1 from my master branch and applied second zip file contents on top of that. committed those files in the branch and did 'git checkout master; git merge b1' - but, i do not get my changes, only his changes in my master branch.