"Dead" network on WNR3500L (/U)

I would like to get some help with restarting/reusing my old Netgear WNR3500L, if possible.
It has been laying unused and powered off for some years and I'm not sure which image that was running (or recently installed) at that time.
Now I can't get ANY answer on ping from any port.
No visible life in Wireshark on connected computer during pings or router start-ups.
30-30-30 reset done, nvRam erase done.
Good communication through USB-serialTTL.
Can communicate with CFE and BusyBox.
Real kernel hangs or loops. Can't load another image through TFTP since network is down.
Is there any command(s) that I can use to start up the wired network or definitively define it as dead?

CFE for WNR3500L version: v1.0.36
Build Date: Tue Aug 11 15:09:14 CST 2009
Init Arena
Init Devs.
Boot partition size = 262144(0x40000)
Found a 8MB ST compatible serial flash
et0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller
CPU type 0x19740: 453MHz
Tot mem: 65536 KBytes

Device eth0:  hwaddr C0-3F-0E-BE-B8-84, ipaddr, mask
        gateway not set, nameserver not set
Startup canceled
BusyBox v1.7.2 (2013-05-08 16:16:32 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

@ow4711, welcome to the community!

No such thing in OpenWrt.


Then your device is dead...but then you show BusyBox... :confused:

Sounds like the switch chip is dead.

Thank you, for the reply!
BusyBox was accessed through the serial interface. A bit later in the startup, after CFE and more messages, there's a "Hit enter to continue ..." which leads to BusyBox.
I forgot to mention that the LED's lights up as expected when a cable is connected/disconnected Also in the other end of the cable.
If that matters, in some way.

I was hoping some variable(s) that could be set/changed or a "register" or something that can be written to activate the network on a lower level and make it possible to load a new image.