Here are the steps listed in the wiki. On which step are you on when you receive that message?Originally Posted by fourfone
0. Install Gordon's Gate flash driver (found in the A2Uploader ZIP file) and reboot.
1. Shut down the phone.
2. Run A2Uploader and click the FileSystem Tool button
3. Hold down 2 on the phone and plug in the USB cable
4. Release the button when you see some activity on the left side of the A2Uploader window