[QUOTE=negritude;2098904]How did you upgrade the firmware? Explain exactly what you did.[/QUOTE]
I downloaded the firmware from BenQ official site and tried to upgrade on Windows 2003 but it failed. Therefore, I installed DW1640 on my friend’s XP and did upgrading successfully. Then, I moved it back to my Windows 2003 but it still did not work. Because I suspected such error caused by some drivers on windows, I reinstalled again but such error still occured. So, I posted it here for help.