RT-87U How to Change WAN Connection Speed to 1000 Full Duplex

Hello there,

I am using the RT-87U. I can ssh to the device. However I don't know the commands to change the WAN port to 1000 FULL DUPLEX. Can anybody help me please?

It is currently at only 100 FULL DUPLEX. I am using Merlin 384.13_10 if it matters.

May I know the ssh commands to change the WAN to Gigabit please?

Thank you.