Unfortunately, Winterbreak doesn’t work on Kindles with the latest firmware (5.18.1 or 2). And there’s no way to downgrade the firmware to an earlier one without having previously jailbroken your device.
So now it’s a waiting game to see when the new method for the latest firmware will be ready for the public.
So now it’s a waiting game to see when the new method for the latest firmware will be ready for the public.