iOS 12.4. 9 is an exclusive operating system update that was released for devices that are not compatible with iOS 13, iOS 14, and above. It supports the iPhone 5S, iPhone 6, iPhone 6 Plus, iPad Air, iPad Mini 2, iPad Mini 3, and iPod Touch (6th generation). So now you can jailbreak iOS 12.4.9 with the above-mentioned iDevices using the below-mentioned jailbreak tools.