Well...
If it was me, I'd take the SD card from the new scanner and put it into the card reader for my computer.
Then I'd use Sentinel and go to Update>Update Firmware. Sentinel will check that the latest firmware is being "seen". (When using an SD Card in the card reader, for programming purposes, Sentinel thinks the card is the scanner.)
If a firmware update is appropriate, Sentinel will write the files to the SD card. You can then eject the SD card and re-install it back into the scanner and turn the scanner on. The scanner will then do a firmware update. Just follow the easy instructions shown on the scanner.
Following that, your next steps would be to program the new scanner with a Profile, Favorites Lists (if any) and update the database, as you've done with the other scanners.
While you can connect the scanner to the computer (using Mass Storage mode), you can do all these steps, the card reader method hastens the process.