With unc0ver, we can jailbreak our Apple TV on tvOS 13.4.5. However, tvOS 13.4.6, which was released few days ago, fixed the vulnerable that unc0ver uses. Unlike iOS/iPad OS devices and Apple TV 4, there’s no ipsw for Apple 4K devices. Therefore, in general, you can only upgrade your Apple TV 4K to latest tvOS version. That’s why I write this tutorial. With this method, you can upgrade your tvOS to 13.4.5 while SHSH is still signing!