Instgram plugin update

If it is a plugin malfunction that is preventing logging into the dashboard

In that case, here’s a link to instructions for a way to disable all wordpress plugins manually, the goal being to at least get you to the point where the dashboard can be logged into:
http://codex.ww.wp.xz.cn/FAQ_Troubleshooting#How_to_deactivate_all_plugins_when_not_able_to_access_the_administrative_menus.3F