Piwik 3 version display error

Hi I am not sure if I have done anything wrong in updating Piwik 2.14.1 to Piwik 3 . I have followed the guide and replaced the /piwik folder with the new version Piwik 3 but on checking the administration page and I get the version is still Piwik 2.14.1. Is this a bug or I have not updated it correctly? Please advise. Thanks.

Delete all files (except your config/config.ini…php and reupload a clean 3.0.2 release)