Any software upgrades brings additional features and strong security, so you should update your system with new updates. Updates version of iOS means old bug fixes and new security patches that guard your iPhone, run it properly with the times without any error. It certain end of jailbreak with the new iOS upgrades comes. The same has happened with 11.4.1 as Apple stopped signing iOS 11.4. You can’t jailbreak your iPhone if you upgrade to 11.4.1 version.
Apple devices don’t consider iTune if stops singing in a software. It will never install on your iPhone. In jailbreaks word system always stay behind from Apple iOS updates. Because it will take time to exploit iOS. You can’t back to older version once you upgrade complete. In future the 11.4.1 will be ready for jailbreak.
Currently jailbreak developers are working on iOS 11 have offered us with a semi-tethered jailbreak for iOS 11.2 during iOS 11.4 beta 3. It’s notable that iOS 11.4 and lower versions are no longer to sign in by Apple. That’s why you’re not able to go back once you upgrade to 11.4.1 version. You only can jailbreak once some expert find out solution to jailbreak of iOS 11.4.1 version.
Downgrade to lower version of iOS version
There are ways roughly this issue, but it require some forethought and preplanning. You can save your SHSH2 blobs to relapse your iPhone to iOS 11.4, even when Apple stops signing it. iTunes think 11.4 is still signed by this method which allow you to downgrade back to a version of iOS friendly with the most stable jailbreak accessible today. If you are still running iOS 11.4, think about saving your SHSH2 blobs as jailbreak cover.
If you’ve already upgraded to 11.4.1 without saving your blobs, all hope isn’t lost. While you cannot jailbreak your iPhone as it presently stands, devs might locate an exploit to jailbreak iOS 11.4.1. However, it’s possible this version will be skipped completely for iOS 12, as Apple’s next big software release — currently in beta in testing mode — is right around the corner. In preparation, however, you might want to save those blobs now, before Apple stops signing 11.4.1.