SNK rolled out an Xbox Series X|S upgrade for its fighting game Samurai Shodown back in 2021, but for a long time it's gone without rollback netcode.
Fortunately, all of this changes today. After it was originally scheduled to arrive in September last year, this update has finally been released. You'll be prompted to update your copy of the game next time you launch it.
This is a free update as well, so all you need access to is a copy of the game. And for anyone wondering - rollback netcode basically aims to minimise delays in fights, making the experience smoother online, and is generally preferred within the competitive scene.
The previous major Xbox update for Samurai Shodown in 2021 added 120 FPS support on the Series X and S.