If you haven't seen it yet, check out this brief FAQ on why it's not recommended to update for those hoping to jailbreak their PS4 console when a new public exploit is released.
Also you don't necessarily have to update to Sony's latest OFW... here is a Guide on Updating to a Specific PS4 Firmware, but keep in mind if Sony's force_update is greater than what you're updating to then you would need to meet their requirement to access PSN on their servers.
To Update from USB also ensure the PUP file path and name is accordingly and in CAPS on the removable device: /PS4/UPDATE/PS4UPDATE.PUP with PS4 Firmware (OFW) archives available HERE and HERE.