Kindle 5.6.5 jailbreak was released, it is not complicated to complete. But, make sure your Kindle's firmware version is 5.6.5. If the firmware version is lower than 5.6.5, please maually update it to 5.6.5. If it is upper than 5.6.5, such as 5.7.2, you need to downgrade to 5.6.5.