After git flow init, how to remove git flow model?
Even, I removed related config from .git/config file.
You can do what @Peter said from the command line too!
Those commands remove all the sections of the git config file related to gitflow.
git config --remove-section "gitflow.path"
git config --remove-section "gitflow.prefix"
git config --remove-section "gitflow.branch"
Then you can re-init gitflow as usual.
git flow init