A: Check Tools → Port → correct COM. Also try pressing reset button on board right before upload starts.
Here’s a complete content package for "CH340 Driver on Windows 11," including a blog post outline, troubleshooting tips, and social media captions. Title: How to Install CH340 Driver on Windows 11 (Fix USB-to-Serial Issues) ch340 driver windows 11
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). A: Check Tools → Port → correct COM
Having trouble with Arduino, ESP8266, or USB-to-serial adapters on Windows 11? Follow this step-by-step guide to install or fix the CH340 driver. " including a blog post outline