Note: Before you begin, you must make a complete backup of your device to either iCloud or locally using iTunes. In case anything goes wrong, you can always get all of your data back using iCloud/iTunes backup.
Ready? Lets begin!
Step 1: Even though this jailbreak tool works on older versions of iOS 8, as mentioned above, we recommend updating your device to iOS 8.4 first if you haven’t already before going ahead with the jailbreak. You can get the iOS 8.4 firmware file from here: Download iOS 8.4 Final IPSW Links For iPhone And iPad.