You’ll need to modify the soundcard in the curvy by hacking.
I know that "fluffd" is there to make interacting and controlling Furby Connect and maybe works on Furby booms via BLE from your Linux, macOS, FreeBSD or Windows computer simpler. Thanks to its client-server model, it can also easily be used on something like a Raspberry Pi. fluffd requires either builtin Bluetooth Low Energy (e.g. the one integrated into Raspberry Pi 3) or a USB Bluetooth 4.0 (or higher) adapter.
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This video might help: https://youtu.be/Ab8X_F715dw
Here’s a site that may help: https://poppopret.org/2013/12/18/reverse-engineering-a-furby/
Here’s another site that might help: https://blog.adafruit.com/2013/01/28/hacksby-hack-a-furby-project/
This site might help: https://www.myget.org/feed/furby-boom/package/nuget/furby-boom-cheats
This site might also help: https://github.com/Jeija/bluefluff