Upgrade from 5.2.1 to the lastest
PermalinkIs very dificult? Where there is clear information?
where
Thanks
Janxes

If you need help, contact me, I'm currently writing a tutorial on this. Also, I could update it for you.
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VERY IMPORTANT: Make sure you back up your database.
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Use the dashboard to backup the site, and store that somewhere.
To manually upgrade upload a concrete version into your updates folder
in your site.php add the version you are upgrading to
define('DIRNAME_APP_UPDATED', 'concrete5.X.X');
(You can try without running the following line sometime this will work, but the version you are I believe requires some db changes so will probably need the following bit)
I would be very wary about upgrading to the latest 5.5 version though? directly from 5.2, its safer not to.
Add the following to your url /index.php/tools/upgrade?force=1
To roll back you can delete comment out the version in your site.php,
Depending on what changes where made to your database you may need roll back you database.
I would probably do as Nicole suggests and upgrade one version at a time.
But make sure you backup your database!