If you are upgrading you do not touch the config.php file at all, leave the original in place.
Then upload and overwrite all the files into your forum dir. (config.php will not overwrite as it will be called config.php.new in 3.8.3 dir, which is what you want!)
Then point your browser to your /forumdir/install/upgrade.php and follow the on screen directions.
It's clearly set out in the manual also!
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