You must manually roll back to an older version of the driver (such as version 3.3.2.102 or similar from 2008–2014). Right-click the device in Device Manager -> Update driver -> Browse my computer for drivers -> Let me pick from a list of available drivers on my computer , and select the older version. Fix "Device Not Recognized" or Missing COM Port If the cable doesn't show up in Device Manager at all:
Once you know the chipset manufacturer, download the official, clean driver from the source. Do not use third-party driver-update software.
The marking itself offers no clue as to which chip is inside your cable. To identify it, you must investigate through your operating system. awm 20251 console cable driver download fix
This guide will help you identify the correct chipset inside your cable, download the official drivers, and fix common connection errors. Step 1: Identify Your Actual Cable Chipset
You must manually roll back to an older Prolific driver version (such as version 3.3.2.102 or 3.8.25.0). Download the older driver assets, choose "Browse my computer for drivers" in Device Manager, click "Let me pick from a list," and select the older version from the list. Cable Connects but Only Shows Gibberish Text You must manually roll back to an older
To fix issues with your console cable, you need to identify and install the correct USB-to-Serial chipset driver rather than searching for the cable's physical model number. The text printed on your cable, "AWM 20251"
| Error | Cause & Fix | | :--- | :--- | | | Usually a Prolific chip issue. Fix: Uninstall the current driver in Device Manager, restart, and install the legacy v3.3.2 or v3.8.12.0 driver instead of the latest one. | | Code 43 (Device Descriptor Failed) | The computer sees the cable but cannot talk to the chip. Fix: Uninstall the device in Device Manager (check "Delete driver software"). Unplug, restart Windows, disable Driver Signature Enforcement (Hold Shift + Restart), then reinstall the driver. | | Garbled Text in Terminal | The baud rate is wrong. Fix: Set baud rate to 9600 in PuTTY/Tera Term. If it fails, try 115200 baud. | | Blank Screen / No Output | You selected the wrong COM port or there is a physical connection issue. Fix: Unplug and replug the cable. Press the Enter key a few times. Try all COM ports if unsure. | Do not use third-party driver-update software
. You will likely see a yellow warning icon next to a device named "USB-Serial Controller" or "AWM USB Interface". Right-click it > Properties Hardware Ids from the dropdown. : You need : You need Microsoft Learn Step 2: Download & Install the Correct Driver