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Can't upload rom to lightcrafter 4500. Checksum mismatch

Hi,

My name is Junling. Our lab has a lightcrafter 4500. we removed the light source part because we don't need it. Yesterday, lightcrafter was working. I applied default solution and could see a clear pattern on the DMD chip. Then, I tried to upgrade the firmware, but i failed, the error info. said "Checksum mismatch: Expected ******; Received *******" (note that every time I failed to upload the firmware, the expected and received numbers are different, so i use "****" to represent those numbers).  Now,  although the GUI can still connect to the lightcrafter, the GUI cannot recognize the firmware version. GUI erased the flash when I tried to upload the rom, but I also failed to upload the rom. Does it mean there is no rom in the lightcrafter? I am not sure how should I deal with this problem. The following is the screen print of the GUI. What should I do to fix it?

Thanks,

Junling