But every iDevice user should know one thing the Cydia can't install directly to the iDevices that cydia will automatically install on iDevices after jailbreak process is totally succeed.
But jailbreak tool developers didn't introduce a suitable jailbreak tool for iOS 8.4.1 therefor cydia not available for iOS 8.4.1
Hence there are lot of fake cydia for iOS 8.4.1 apps stroll around the Internet and you should come to know when download and run that apps.
I have an idea if you want to jailbreak your iDevice which run on iOS 8.4.1 ,you should consider one of following way.
- Downgrade iDevice for iOS8.4
- Upgrade iDevice for iOS9
Jailbreak tool for iOS 8.4
- TaiG
- PP Jailbreak
- Pangu 9