It took me awhile to figure this out too. Hook up your HP to your to your computer. Select mass storage when prompted.
Right click on the V2.3scn file and copy it.
Go to your start menu then computer. Look for you’re your HP files mine is in removable disk I.
Click on that to open. Then click on Home Patrol to open then right click on firmware then hit paste. When the progress bar completes unplug the serial cable and the 2.3 firmware should load. It will be in red letters and takes a minute or so. That should do it.