go to phpmyadmin or whatever you have to work with your database.
make sure your database is showing. on the right side you will see all the tables listed.
find the sessions table and click in the check box to select it.
now, down at the bottom will be a drip down box that says "with selected" choose empty. do NOT drop it or delete it, choose empty or truncate.
you are done.
now, there should be no fear of losing everything when updating. all of your posts, members, forums etc. are in the database and you do not mess with the database when updating except for the last stage and you can't hurt it during that part.
the best way to update if you don't have a lot of MODs installed is to simply replace all the old files with new ones except for the config.php file.
then, since you just uploaded the install folder, in your browser, go to:
when it says it is done, you delete the install folder and poof, you are done.
you now have a brand new up to date board with all your members, forums etc. intact.
of course, you should always make backups of everything before you start this process.
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