from Realtek for macOS 10.15+.
Throw away your 8188GU adapter and buy an adapter based on the Realtek 8812BU (for AC1200) or an official Apple-certified dongle. realtek 8188gu wireless lan 802.11n usb nic driver
The driver for the Realtek 8188GU Wireless LAN 802.11n USB NIC plays a pivotal role in enabling the operating system to recognize and interact with the wireless adapter. Without a properly installed and functioning driver, the computer cannot utilize the wireless adapter to connect to a network. The driver translates operating system requests into commands that the wireless adapter can execute, facilitating tasks such as: from Realtek for macOS 10
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