I'm amazed that the manual or online directions don't give any clue about what to expect when upgrading firmware. Pretty significant oversight from the documentation team. How are we supposed make an informed decision about our equipment maintenance? So, I'm asking here.

After a firmware update, does this device keep all of the settings and remain connected to its network? Or does the upgrade render the device 'wiped' with all factory default settings, requiring us to set it all up again? Or, something else?