After updating the plugin Notifications, then the Update Plugin DB is not working and giving the following error. I have changed folder permission to '777'
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@mallumag.in and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
After this updation site is going to the maintenance page and none of the admin menu is working.
Please help me to fix the problem or else How to revert the updation?
Shijumon Joseph