In this video, I have good news for those of you waiting for CheckRa1n jailbreak to be updated for iOS 15. Just a couple of hours ago, developer Siguza has updated parts of the PongoOS, a major component of CheckRa1n in the iOS 15 branch on GitHub, thus hinting at active development towards iOS 15 support.
Apple has also stopped signing iOS 15.3 today which means you can no longer update or downgrade to it, however, iOS 15.3 RC which is very much the same as iOS 15.3, is still signed by Apple. So is iOS 15.2 Beta 2, so definitely go ahead and save the blobs if you want to downgrade / upgrade in the future for Jailbreak purposes.
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