Hello Narian,
I searched the Support Pages and I could not find any info on upgrading the firmware by USB. Here are the steps to perform the upgrade via CentreWare Internet Services.
Hi . How to get usb to boot Xerox 7845? What programs should be in this usb? Where to download these programs? Due to the software jumping, the machine gets stuck on the green screen when booting, and is in a restart cycle.