This is an original research, please mention me or link this post if you forward this article to any other medium.
Unlike other articles which are for pro-users and developers. I will try to explain as detailed as I can in this article since it’s a very serious security issue for most iOS users. In Sep. 2019, security researcher @axi0mX found an epic exploit of most iOS devices, which named “checkm8”. It’s a bootrom exploit, which can’t be patched with any future iOS software updates.
And few days ago, the first jailbreak tool which based on checkm8 exploit was released, the tool is “checkra1n”.