Possibly. Most Update 14 mods require a new save because they change the Pokémon species list and item indexes. Back up your save using Checkpoint before patching.
: The patch addressed minor technical bugs to provide a "smoother" and "more fun" experience. pokemon omega ruby update 14 updated
“Something’s waking up,” May whispered. Possibly
The 1.4 update fixed a bug where certain Mirage Spots (Islands) would not respawn. With the update: pokemon omega ruby update 14 updated