If you do have the wrong firmware in the scanner (yellow dot / red dot) then you will need a special factory firmware reload jig and if you have the newer style SLG board, you will also need an adapter for the jig.
The update jigs plug directly into a special port on the board itself and are low level firmware. Just enough to get the machine to boot into the 49 mode and properly load firmware via usb.
These jig's are generally borrowed from your local regional service manager so good luck....there are 3 different styles of jigs, two different adapters and if the jig does not have the firmware on it already then you are going to need the jig version of the firmware and an eeprom writer. Of if you have the oldest version of the jig, you will need an eprom burner.
If you have the wrong firmware in the scanner board and the machine will not function, your best bet is to do two things
1) order a scanner board of the correct type for your machine. Follow the proper board replacement procedure in the manual. reload all firmware to latest version which is V330 (old style machine) V335 (new style machine)
2) Fire that technician
Good luck
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