Web interface is not good (convoluted, poorly played out, has many options hidden or options not applicable to a specific switch) or reliable and really should not be counted on. Also little to no support can be found online from the company or here/reddit type users.ok so i got through the updating and licensing,
at what point can i disconnect the serial cable and configure through web interface?
But you should be able to get to the point where you can ssh into the switch from a computer on the network and disconnect the serial cable.