The Tamil dubbed version of "Memento" is available with the title "மெமெண்டோ" (Memento). The movie has been dubbed into Tamil and is available on various platforms.
I assume you're referring to the movie's video quality. A 256 updated version likely refers to a high-definition (HD) or full HD (FHD) version of the movie with an updated video quality of 2560 x 1440 pixels or 3840 x 2160 pixels (4K). memento tamil dubbed movie 256 updated