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N66U eth1 and eth2 not found (no wireless)

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NewportNewf

New Around Here
I have been using DD-WRT on this N66U HW Ver:B1 for over 3 years without issue. Suddenly I noticed it was no longer connecting to my main router over wireless (using N66U as bridge from my AC3100). Devices connected to it over Ethernet would not receive any IP address.

I've restored multiple firmwares using the restoration utility, DD-WRT K3, Merlin 380.64_2, and latest official Asus firmware. Merlin and official both report the device is not an official ASUS device on the main splash screen.

After taking it apart and connecting to the serial port, it seems that eth1 and eth2 aren't being found and is messing up the initialization of the device.

et_module_init: passivemode set to 0x0
et_module_init: et_txq_thresh set to 0xce4
bcm_robo_enable_switch: EEE is disabled
eth0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 6.30.163.2002 (r382208)
set_wltxpower(0x023e): unit: 0, txpower: 100
set_wltxpower(0x023e): unit: 1, txpower: 100
hotplug net INTERFACE=eth0 ACTION=add
wl_module_init: passivemode set to 0x0
1: check_action 0
start jffs2: 4, 8388608
/ # start_logger:
_ifconfig: name=eth0 flags=1043 IFUP addr=(null) netmask=(null)
update_lan_state(lan_, 0, 0)
generate_wl_para(0x0a4e): unit 0 subunit -1
eth1: WLC_GET_VAR(cap): No such device
num_of_mssid_support(0x0093): [mssid] support [3] mssid
generate_wl_para(0x0d51): bw: 0
generate_wl_para(0x0d53): chanspec: 0
generate_wl_para(0x0d54): bw_cap: 3
generate_wl_para(0x0d5a): obss_coex: 1
wlconf_pre(0x0e8f): set vhtmode 0
hotplug net INTERFACE=vlan1 ACTION=add
hotplug net INTERFACE=vlan2 ACTION=add
generate_wl_para(0x0a4e): unit 1 subunit -1
eth2: WLC_GET_VAR(cap): No such device

I've also upgraded the CFE to 1.0.1.9 but no change in state. I fear it may be a hardware issue, but I'd like to rule out all possible SW/FW causes first.

Bootup + NVRAM dump: https://gist.github.com/anonymous/d3a170094b2e2ad9adc7ecf4ad5ca591

I hope to revive it if possible, it has been an excellent device up until now.
 

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