Per the instruction guide, a TB3 is required to be connected during the update.
However, I am only using a USB-C to full DP cable to connect to my Dell 1440p monitor and it gave me an error.
Is there another way to update it?
I understand that you are currently experiencing issues when trying to update the firmware of the thunderbolt* port.
Regarding this, as long as the cable is an actual thunderbolt* cable (It has the thunderbolt* symbol on it) there should not be any problem with the installation of the firmware. If there is an error then please provide me with a screenshot of it so I can use it as a reference.
Thank you for your response,
It should not really be necessary to be honest. The firmware is actually to improve the connectivity between the Thunderbolt* devices and the unit. Since you are using it to connect via display port it should not really be needed.