If some bundled plugins refuse to update, then go to Plugins and disable the plugin that is not updating. Then try again to update it as explained.
If that still won’t help for some plugins then in a zip file with a theme(and in theme folder on your FTP) you will find ZIP files with plugins and you can upload them manually. Files are located in theme directory in
advanced/plugins. You may need to delete plugin before doing this. Proceed same way like when plugins fail on installation.