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The 1.5 update primarily focused on stability and anti-cheat measures: Anti-Cheat Reinforcement
Fixed a menu image bug for the Pokémon Vivillon that appeared in the Friend Safari.
This query could be referring to a few different things: Specifically, the version 1.5 update released to fix bugs and add compatibility for the Nintendo 3DS.
A decrypted 3DS file is a type of file that has been modified to allow it to be played on a Nintendo 3DS console without the need for a physical cartridge or official digital download. Decrypted files are often used by gamers who want to play games on their consoles without going through the official channels.