New Hub Two delivered but i need to know how to set into modem mode only

[#1]

OK i think i have a few several issues and bouncing between here and Opnsense Forms both very friendly and helpful.
The Hub 2 i will check again directly tomorrow i will have to move a PC down to the cellar to check directly with a cable directly from  the Hub 2.

The other issue is with my Opnsesne router i believe its not good enough to deal 900mb due to its hardware. It connecrts but soon as a throw a 2gb file at it it loses connections i think they call it called "interface is flapping" due to Realtek NICs.

So i may need to buy a better Intel NIC  Protectli VP2420 - 4x 2.5G Port Intel ® Celeron J6412 

So sorry if i came across a little rude just very frustrating lol 

[#2]

Your products

Full Fibre 900

[#3]

OK
I added the drivers today as suggested from Opnsense forums the "os-realtek-re" been running all day fingers crossed looks good.
Tried downloading some big files through the router to stress it looks OK so far.
Cheers for all the help and advise great forums and members from here as well