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DLP4500: DLP4500 Become Unknown Device in Windows' Device Manager After Flashing

Part Number: DLP4500

Hi, I am trying to flash new firmware to my DLP4500 using DLP LightCrafter 4500 Control Software. After it finish flasing and prompt "Download Complete" message, I clicked OK button and close the control software. After that, I try to open my custom application which can connect to my DLP4500 before and it said failed to connect to projector. I then close my custom application and reopen the LightCrafter control software. However, the "Connected" icon showed red color icon. No matter how I try to remove the plug and replug, uninstall device driver and reinstall, restart PC, it continue to show "Unknown Device" under my device manager list. Can anyone analyse for me what is the root cause behind this? and any good way to resolving it? Your help would be very much appreciated!