Bought some awesome new active monitors(speakers) but they wanted 40 more bucks for the Bluetooth module.. I figured hey I got these old broken Sony BT headphones.. My first time hacking something
hardware - How do I extract the firmware from this bluetooth speaker board? - Reverse Engineering Stack Exchange
Bluetooth Hacking, Part 1: Getting Started with Bluetooth
Bluetooth security flaw (KNOB) lets hackers hijack speakers | Comparitech