The Nintendo 3DS architecture, and by extension the Citra emulator, is optimized for 64-bit processing. While there were experimental, unofficial forks of Citra designed for 32-bit processors, their performance is notoriously poor. Even if a user manages to sideload an old version of a 32-bit compatible emulator on Android 4.4.2, the device likely lacks the RAM (usually 1GB or less on KitKat devices) and the CPU power necessary to render 3DS graphics at a playable frame rate. The result is often a slideshow of broken graphics and audio stuttering, making the game unplayable.

: You can install an older version of RetroArch compatible with Android 4.4.2. Once installed, check the "Online Updater" for a Nintendo 3DS (Citra) core. Note: It is highly unlikely to run at playable speeds on KitKat-era hardware.