I found a site that had what claimed to be factory file for it, but I wouldn't trust it much. It was called skyfiles, or something similar, I'm sure you can locate it also. I didn't want to post a link to what is probably a hacker site, even though they are mostly useless now anyway.
Maybe another owner of the 6100 will come up with it for you here!
edit to add : Another warning I read>from one of those sites : It said Beware of downloading and using the Coolsat loader program also. Claimed that any version found on the net contains a trojan SO to avoid this trap, USE the USB drive to load firmware! (provided you find the right firmware)