The different operating modes for Kareha are implemented using different sets of template.pl & config_defaults.pl files. The template.pl file contains all the HTML generation for the board look, while config_defaults.pl is set to use the appropriate options for the board type, so you do not have to worry about setting all the esoteric options correctly yourself.

These files are stored in the mode_message/ and mode_image/ directories. To install Kareha, you pick the board type you want and copy the files from the corresponding mode_ directory into the main directory. If you forget to do this, you will get a message telling you to do it.

Those who are upgrading from older versions of Kareha can just treat this as any other upgrade, and use the files from mode_message/. Those upgrading from Wakaba Zero will have some more work to do, which I will explain further down.