₦airaland Forum

The best solution in case nothing helps could be microsoft project recovery
Visit microsoft article on - https://support.microsoft.com/en-us/help/323330/how-to-back-up-schedule-and-restore-a-microsoft-project-server-databas
This is the resource of manual: http://project.mvps.org/faqs.htm#Handling_project_file_corruption_and/or_bloat
Or alternative variant can be https://project.recoverytoolbox.com/