Be cautious when modifying system files or using unofficial plugins, as they can potentially cause issues with your PS3 or compromise its security.
Open dev_hdd0/boot_plugins.txt (or create it if missing) and add the path, for example: /dev_hdd0/plugins/myplugin.sprx .
Place your .sprx or .prx plugin files into a folder on your PS3's internal hard drive. The standard location is: /dev_hdd0/plugins/
When you search for a direct download of a config file, you bypass the verification process.