Reconnect the cable. In Device Manager, under Ports (COM & LPT) , it should now show "Prolific USB-to-Serial Comm Port" with no warning symbols.
Phase 2: AWM 20251 Console Cable Driver Download & Installation Depending on your chipset, choose the appropriate download. Solution A: FTDI Driver (Most Common)
This article provides a comprehensive guide to , covering Windows 10, Windows 11, and troubleshooting for common issues. What is an AWM 20251 Cable?
The designation refers to a standard for Silver Satin telephone or serial wiring used in many console cables, such as those for Cisco systems. If your cable is not working, the "fix" involves installing the driver for the USB-to-Serial chipset embedded in the USB end of the cable , as the AWM 20251 wire itself does not require a driver. 1. Identify Your Chipset awm 20251 console cable driver download fix
Unplug the AWM 20251 cable from your USB port and plug it into a different USB port (preferably directly on the motherboard, not a hub).
After the driver is fixed, ensure your software is configured to talk to the cable: 9600 (Standard for Cisco/Console). Data bits: 8 Stop bits: 1 Parity: None Flow Control: None Summary Checklist Potential Solution Yellow Exclamation Mark Install Prolific/FTDI Driver Code 10 Error Roll back to an older driver version No COM Port assigned Change USB ports or check "Hardware IDs" Garbage Text in PuTTY Match the Baud Rate (usually 9600 or 115200)
The exact or Error Code showing in your Device Manager Reconnect the cable
Download the CP210x Universal Windows Driver.
In Device Manager, right-click the port > > Port Settings > Advanced .
| Scenario | Verdict | |----------|---------| | Legacy driver worked | – but never update drivers. | | Legacy driver failed | Toss – Get an FTDI-based adapter (e.g., "USB to RS-232 with FT232RL"). | | You need Win11 24H2 compatibility | Toss – Prolific has officially dropped support. | Solution A: FTDI Driver (Most Common) This article
Visit the website of the device manufacturer or the Prolific website to see if there are updated drivers available for Windows 11. Microsoft Community Hub USB Console Cable Windows 11 connection to IR1101 router
Some terminal programs (like older versions of Putty) cannot access COM ports higher than COM4. Open and expand Ports (COM & LPT) . Right-click your serial port and select Properties . Go to the Port Settings tab and click Advanced .
Open again and expand the Ports (COM & LPT) section. You should now see a clean entry without any yellow exclamation marks, such as: USB Serial Port (COM3) Prolific USB-to-Serial Comm Port (COM4)