how do i upgrade phpbb?

i am currently running phpbb 2.0.11 on my server and i wish to upgrade to version 2.0.17 which is the newest version.

is it possible for me to directly upgrade to version 2.0.17 from 2.0.11?

also, if i am to upgrade, how can i go about upgrading without losing any of my settings or posts?

 

 

 

 

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