We have good news for those who are unable to use the new checkra1n jailbreak tool due to
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The exploit is relevant for iOS versions 12.4.1 and 12.4.2 and can lead to the appearance of jailbreaking of these versions on all devices, starting with A12 (X) devices.
For iOS 12.4.3 and newer exploit, unfortunately, is not relevant. In this regard, we always advise to stay on the lowest possible version of the system, if possible, in order to be able to use jailbreak in the future. If you already have a newer version, then, alas, you can no longer roll back.
Chimera and unc0ver tools supportmost versions of iOS 12, but not iOS 12.4. If tool developers use the new exploit, then the possibilities of jailbreak will become even wider and more accessible. Of course, there is no guarantee that this will happen.
If you want to know more about the exploit, you can read about it here.