The repository (Karen's Repo) is currently down due to severe hardware failures and server maintenance . As of late 2024, the owner reported that the server hardware provided by a friend failed, making restoration more complicated than initially expected. Current Status & Fixes
http://cydia.akemi.ai/
The cydia.akemi.ai domain may have an expired or misconfigured SSL certificate. Cydia (especially older versions) is picky about HTTPS. You could try http:// instead, but many servers now force HTTPS.