Once you know that you have the desired firmware downloaded, install it. The directions for installation are those of Section 6.3.6. Follow those directions. Once the new version of Sailfish is installed, your printer will reboot itself. You should see the new version number displayed in the “splash” screen (Section 3.1) when the printer reboots. You can also check the version information via the “Version Information” item of the “Utilities” menu, Section 3.7.22.