Let me try to understand your issue here...
You bought a new DIR880L.
Your DPC3925 > Bridged router (To be used as a modem only)?.
Your DIR880L > Main router.
Am I right on this?
What you can try to do, is to disable the wireless on the DPC3925, & set the operating mode to "Bridge".
Once that is done, connect your RJ45 from the internet port of the DIR880L to any of the LAN ports of the DPC3925.
Connect your RJ45 from your laptop to your DIR880L and head over to the admin page & you can start configuring your router from there. (:
Hope it helps you.
Faris Alvin Lim
*Note: My posts are not in anyway directly related to StarHub, but rather as an individual's opinion.*
Thanks for responding.
That's exactly it. The DPC is to act as modem only with the DIR880L as the main router.
I've tried changing the DPC to bridged from the admin page and this is where the DIR880L fails to pick up the internet.
This is exactly the setup I had with the old router so I should be able to work it out but for whatever reason I'm struggling.