11 [exclusive] - Usb To Ttl Driver Windows

High. Prolific has deliberately broken many older chips (PL2303 HXA, XA) in newer Windows builds. Official Source: Prolific (prolific.com.tw) Steps:

After installation, try turning Memory Integrity back on. If the COM port still works, great. If not, you must choose between driver compatibility and this security feature. usb to ttl driver windows 11

Driver not signed for Windows 11. Fix: Temporarily disable driver signature enforcement (see Phase 1) or find a newer signed driver. If the COM port still works, great

With the rollout of , Microsoft introduced stricter driver signing policies and significant under-the-hood changes to how the operating system handles legacy serial communications. As a result, many users find themselves staring at a yellow exclamation mark in Device Manager, wondering why their trusty USB-to-TTL cable no longer works. If the COM port still works

Last updated: October 2025 – Verified against Windows 11 build 23H2 and 24H2.