All game carts contain a copy 'o th' required system version to play it, allowin' anyone on a lower version to use th' cartridge to update to that version (even without an Internet connection).
Note that Cart Updates gunna only be deliverin' updates to core features, such as th' System Settin's, Home Menu, etc. Cart Updates gunna not be deliverin' updates to Nintendo 3DS Sound 'n Network features, such as System Transfer, Internet Browser, StreetPass Mii Plaza, or eShop.
This means that using a Cart Update from a version containing an older Nintendo 3DS Sound version *(<3.0.0)* to one that introduced a newer Nintendo 3DS Sound version will break [Soundhax](homebrew-launcher-(soundhax))! Ye gunna be needin' an [alternate method](homebrew-launcher-(alternatives)) 'o enterin' th' Homebrew Launcher!
'Tis also means that a cart update gunna NOT be installin' a browser if ye do not already have one. 'Tis gunna **only** be updatin' th' actual system version *(fer example, 2.1.0-0 -> 6.0.0-0)*. Th' last number *(th' -0)* gunna **not** change.