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For some reasons I need to degrade WordPress version of a site (I understand that it is not a good practice to do and I can fall into many troubles by doing so) but I still need to do it for some reasons.

I want to degrade from 3.0 to 2.9. I tried to upload the wp-admin folder of WordPress 2.9 installation into my WordPress 3.0 site but it was unable to load all the files. I can not delete the upgraded version as it contains images of posts.

Is there any way to revert back to 2.9? Moreover, is there a plugin that can get this done?

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Like you said, downgrading would be a bad practice and is not at all recommended. Please make a backup of your database before continuing, just to play safe.

It looks like you've only replaced wp-admin folder. WordPress updates are not limited to wp-admin folder. Try replacing wp-admin, wp-includes and all those files in the root directory.

Now clear your cookies and goto:

yoursite.tld/wp-admin/upgrade.php

WordPress might ask you to upgrade your database and continue with it. After this, you'd be running 2.9 (hopefully).

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  • PS: make sure you dont replace wp-config.php in the root. New WP versions come with wp-config-sample.php and not wp-config.php, but do check.
    – thinkdj
    Dec 31 '11 at 16:02

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