Follow these instructions to jailbreak iOS 8.4 using PP jailbreak tool.
Step 1: Download the latest version of PP jailbreak from our download page on your computer.
Step 2: Connect your device to your computer using the USB cable.
Step 3: Disable Passcode from Settings > Touch ID & Passcode.
Step 4: Also turn off Find my iPhone from Settings > iCloud > Find my iPhone.
Step 5: Close iTunes or XCode if they’re open as PP Jailbreak won’t open until they’re closed.
Step 6: Double-click on the PP Jailbreak dmg file, and move it to the Applications folder when prompted. Double-click on the PP Jailbreak icon to launch it.
Step 7: PP Jailbreak will take some time to detect your device. Once you confirm that it is showing the correct firmware version, deselect the Install PP Helper checkbox as it seems to install the Chinese pirated app store.
Step 8: Click on the Jailbreak button at the center to start the jailbreak process.
Step 9: The jailbreak process will take some time. It gets stuck at steps 3/8 and 5/8 for some time. Wait patiently for the process to complete.
Step 10: After the jailbreak is complete, you will get a message informing you that the Jailbreak Succeeded!
Step 11: Your iOS device will reboot automatically, and you should see the Cydia icon on the Home screen. Launch Cydia and install the latest update before you start installing jailbreak tweaks.
Troubleshooting tips
If you’re stuck at step 2/8 for a very long time, then try to turn on AirPlane mode, and also disable Location Services (Settings > Privacy > Location Services) via the Settings app.