If you are reading this, you have likely plugged a USB-to-RS232 (or USB-to-TTL) serial console cable labeled AWM 20251 into your Windows 10, 11, or older PC, only to be greeted by the dreaded yellow exclamation mark in Device Manager. The device appears as “Unknown Device,” “Prolific USB-to-Serial Comm Port (Error 10),” or simply refuses to communicate with your router, switch, firewall, or microcontroller.
Below is a troubleshooting report and fix guide to get your console cable working. 🛑 The Core Problem awm 20251 console cable driver download fix
| Error | Cause | Fix |
|-------|-------|-----|
| Code 10 | New driver with old chip | Install v3.4.63.290 with signature enforcement off |
| Code 31 | Driver corrupt or mismatched | Uninstall all serial drivers with pnputil -e and purge |
| “Device cannot start (Code 10)” after legacy driver | Windows Update replaced driver | Disable automatic driver updates: System → Advanced System Settings → Hardware → Device Installation Settings → “No” |
| COM port number > 20 | Serial port collision | In Device Manager → Port Settings → Advanced → Change COM port to COM3-COM9 |
| Works on USB 2.0 but not USB 3.0 | Power management / signal levels | Use a USB 2.0 hub between USB 3.0 port and cable | AWM 20251 Console Cable Driver Download Fix: The
Step 4: Right-click > Properties > Details tab > Select Hardware Ids from the dropdown. VID_0403 = FTDI VID_067B = Prolific VID_10C4 = Silicon Labs 2. Official Driver Downloads 🛑 The Core Problem Common Errors & Solutions