GNU/Linux Debian Bookworm Installing Broadcom BCM4312 Driver Guide
How to Install Broadcom BCM4312 Wi-fi/Bluetooth Driver on Debian Bookworm 12 GNU/Linux – Step by step Tutorial.
The Package Provides the Source Code for the wl Kernel Modules and makes use of the DKMS Build Utility to Install them for the Running Kernel.

GNU/Linux Debian 12 Broadcom BCM4312 Driver Installation Guide