i had recently switched ci v.3 and i had faced problems my live server redirect to me 404 error page when i hit my url it was perfectly fine on local host but it's not working on server. my .htaccess file is
RewriteEngine on
RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php?/$1 [L]
# 2 ---- Prevent directory file listing in all of your folders ----
IndexIgnore *
Try rename the file to ucfirst for folder controller and model.
Please refer http://www.codeigniter.com/userguide3/installation/upgrade_300.html#step-2-update-your-classes-file-names
Just rename your controller file name: e.g: about.php to About.php