New R2 - Unable to access user interface

[JayT]

I pre ordered an R2 a long time ago directly from the Netduma site and never used it, it sat unused in my cupboard for many years (I got new fibre internet during the pre-order wait and then never got around to using the R2)

Recently I finally took it out of the box to try out.  I'm unable to access the user interface though.  I've tried holding the reset button for 50 seconds whilst plugged in, then 50 seconds whilst it's unplugged, waited 5 minutes and plugged it back in + ran an ethernet cable from the LAN 1 port of the R2 to the LAN port on my PC - I still cannot access the user interface.

I've tried changing my network adapter to use:

IP address: 192.168.77.10
Subnet mask: 255.255.255.0
Default gateway: 192.168.77.1

That also doesn't work.

I've tried a different cable & port, still nothing.  Running ipconfig doesn't even show a default gateway.

What else can I try?  Thanks in advance for any help.

Kind regards,
Joe