The palera1n team released a major update for its palera1n-c checkm8 bootrom exploit-based jailbreak tool for A9-A11 devices running iOS 15.0-16.3 over the weekend, bringing it up to version 2.0.0 beta 1 with a substantial list of changes including a full C-based re-write.
Palera1n-c updated to v2.0.0 beta 3 with more bug fixes & improvements