You're looking for the Broadcom BCM94312HMG driver. Here are some details and download links:
The Broadcom BCM94312HMG is a legacy 802.11b/g wireless network adapter primarily used in laptops manufactured between 2008 and 2012. It is a Half-Mini PCIe card that operates exclusively on the 2.4 GHz frequency band with a maximum data transfer rate of 54 Mbps. Technical Specifications Chipset: Broadcom BCM4312. Standards: IEEE 802.11b/g. Frequency Band: 2.4 GHz (Does not support 5 GHz). Interface: PCI Express Half-Mini Card. Max Throughput: 54 Mbps. Driver Support by Operating System broadcom bcm94312hmg driver
Windows typically includes a basic driver for this card, but it may appear as "Broadcom 802.11b/g WLAN" or a generic "Network Controller" with a yellow warning triangle in Device Manager. You're looking for the Broadcom BCM94312HMG driver
Kernel compatibility: Works up to latest kernel (6.x) with brcmsmac.
Monitor mode: Yes (with b43 + iw). Technical Specifications Chipset: Broadcom BCM4312