When i try to upgrade to last version of persona theme, i get this error "appears to be a git repo or a submodule" and didn't upgrade.
Basically means you installed this theme by doing git clone <url> instead of npm install. So either delete the folder and npm install if you'd like to manage it from ACP from now on, or git pull in the theme directory
git clone <url>
ya.. ok.. i did installed using git clone but i manage to update it through panel.. hm.. guess not anymore.. xD