Connecting USB Wireless Adapter to Xbox 360: Not Supported—Use Official Adapter or Ethernet

You cannot. The Xbox 360 does not support generic USB Wi-Fi adapters (no driver stack).

Official Solutions

• Xbox 360 Wireless Network Adapter (Black, 802.11a/b/g/n): Proprietary USB dongle (discontinued, $40–$80 used). Plugs into back USB; auto-detected.
• Xbox 360 S / E (Slim): Built-in Wi-Fi (802.11n) — no adapter needed.
• Wired (Best): Ethernet cable to router / powerline adapter / MoCA. Zero latency, no config.

Hack (Not Recommended)

Some Linux-on-360 (Free60) / homebrew kernels loaded generic USB Wi-Fi drivers, but this breaks Xbox OS, Xbox Live, and games. Not usable for gaming.

If you have a Fat 360 without the official adapter: Use Ethernet or upgrade to a Slim/E model.