A: Microsoft tightened driver signing for Windows 11. You must temporarily disable enforcement or use the latest signed driver from WCH (v3.8+ is signed).
Screenshot of Device Manager showing "USB-SERIAL CH340 (COM4)" ✅ 4. Troubleshooting FAQ (for support page) Q: Does Windows 11 automatically install CH340 drivers? A: Sometimes, but often incorrectly. Manual installation is more reliable.
A: No official ARM64 driver exists. Use a USB-to-serial adapter with FTDI or SiLabs chip instead.
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