Oracle's support for Entity Framework Database First and Model First has the following version requirement:

• Microsoft Entity Framework 4 or higher, up to and including the 6.x versions.

If using Visual Studio tools, then use Visual Studio 2010 or higher and install Oracle Developer Tools for Visual Studio.

Oracle's support for Entity Framework Code First has the following version requirements:

• Microsoft Entity Framework 6 or higher

• Microsoft .NET Framework 4.5 or higher

  Projects must set the target framework to .NET Framework 4.5 or higher. This can be done by modifying the project's properties in Visual Studio 2012 or higher.