reposted Changing remote repository for a git submodule – Stack Overflow

These commands will do the work on command prompt without altering any files on local repository

git config --file=.gitmodules submodule.Submod.url
git config --file=.gitmodules submodule.Submod.branch Development
git submodule sync
git submodule update --init --recursive --remote
Please look at the blog for screenshots: Changing GIT submodules URL/Branch to other URL/branch of same repository