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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?

Thanks in advance.

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up vote 1 down vote accepted

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

It looks like you've only replaced wp-admin folder. WP Updates are not limited to wp-admin. Try replacing wp-admin, wp-include 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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