We could not get any of the HP 4345’s to update their firmware. The first time that we would update the firmware on one of the printers it would look like it worked but the firmware revision number did not increment. All sequential attempts in updating the firmware would result in errors within the printer’s event log.

Solution: After trying many different things with many different HP technicians even replacing the formatter boards on the printers all together we found a solution. [more]We had to remove the third party BAR DIMM card that was installed on the printer before updating the firmware. My best guess is that it was actually trying to push the updated firmware file onto the BAR DIMM instead of the HD on the printer and thus was not able to read it.