Apple aggressively pushes users to the latest iOS version, which often slows down older devices (planned obsolescence debate aside). With a saved SHSH blob hosted locally, you can downgrade an iPhone 6s from iOS 15 back to iOS 13—provided you have the correct blobs and a compatible sep/baseband.
The reinforced glass between them didn't shatter; it liquefied. The sound waves were so precise, so perfectly tuned to the molecular structure of the silica, that they turned the barrier into a puddle of sludge. shsh host
(as a verb or noun)