AntiVirus, AntiSpyware & AntiMalware Software
Downgrading an iPad 2 from iOS 9.3.5 to iOS 8.4.1 is technically possible only in very limited circumstances (if you have saved SHSH blobs for 8.4.1 for that device and can run low‑level tools). For most users today it’s effectively impractical and risky. Expect loss of data, app incompatibilities, and potential device bricking.
Reboot and Update: After rebooting, go to Settings > General > Software Update. Your iPad should show iOS 8.4.1 as an available update. Important Considerations
Open the Phœnix app and tap Prepare for Jailbreak. The device will reboot, and you should see the Cydia icon on your home screen. Step 2: Edit the SystemVersion.plist
Cons of CoolBooter: