Open the .htaccess under public and replace the content directly, so it should be able to solve
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{
REQUEST_FILENAME} !-d
RewriteCond %{
REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php?/$1 [QSA,PT,L]
</IfModule>