Moving from Joomla 1.5.23/K2 2.4.1 to Joomla 1.7.1/K2 2.5
(this is a work in progress and will be updated)

Please backup your site (akeebabackup is the way to go)

Download and install K2 2.5 right on top of your existing 2.4.1 K2 installation

Check the backend of K2, you will see it is new and the dashboard no longer loads with the administrator but is found
under the "components" menu.

Download and install jUpgrade (registar at

Enable mootools system upgrade

Run jupgrade

Test the upgrade by typing yoursite/jupgrade to see the front end - notice that any menu links to k2 return 404 error

Log into the backend of the upgraded site - yoursite/jupgrade/administrator

Notice that there is no K2 component

Install the latest K2 2.5 in this new site

Go to K2 from Joomla Components menu - check Items - they should all be there

Go to your K2 Categories - Set them to Public in the access level

Go to your K2 Items - Set them to Public in the access level

Test your K2 Menu link - it should work

Delete all the files in your site root except the jupgrade directory

Move all the files in the jupgrade directory to your site root directory

Now address your site as yoursite and yoursite/administrator

Ok 1.7.1 and 2.5 is working and the task of upgrading all other components, plugins, and templating begins!

Had also some troubles with the not being able to see the items.
Have to turn on the Access level.

As I have an enormous ammount of articles... is there a way to do it in 1 step?
Or else I have to set the Access level to Public on 3,071 items :) HELP :)

Backup first
For the item table with phpmyadmin use
UPDATE `ex15`.`j17_k2_items` SET `access` = '1' WHERE `j17_k2_items`.`id` >0;
changing the ex15 and j17_k2_items to your database and table names

Again Backup First
For all the K2 categoires use phpmyadmin
UPDATE `ex15`.`j17_k2_categories` SET `access` = '1' WHERE `j17_k2_categories`.`id` =1;
replacing ex15 and j17_k2_categories with your database and table name

It's not sufficient...at least for my website.

I tried to open and resave again an article and than it would be OK (I could see again the article on my website). If firstly the category didn't show the exact number of the articles, it would show it after I resaved the article.

The changes I see on database on j17_k2_items.params column are

Old: itemImgSize=
itemImageMainCaption=
itemImageMainCredits=
itemIntroText=
itemFullText=....

New: {"catItemTitle":"","catItemTitleLinked":"","catItemFeaturedNotice":"","catItemAuthor":"",...}

I don't know if also the params column for each article should be updated...