Once you are successfully on iOS 8.4.1, you can choose to leave the device stock or jailbreak it for maximum customization. Because iOS 8.4.1 has a permanent, untethered jailbreak tool called , your iPad will remain jailbroken even after reboots.
Once Cydia is open and loaded, you need a way to edit your system files. Open and allow it to perform its initial updates. downgrade ipad 2 ios 9.3.5 to 8.4.1
Reboot your iPad 2 completely. This disables the jailbreak environment but keeps your file edits active. Open the app. Navigate to General > Software Update . Once you are successfully on iOS 8