help recovering bricked rt-ac56u

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maurer
DD-WRT User


Joined: 22 Jun 2009
Posts: 104

PostPosted: Sat Feb 17, 2018 15:27    Post subject: help recovering bricked rt-ac56u Reply with quote
hello community ! Smile

As i wanted to join the ARM world (i already have an rt-n16 and rt-n66u - mipsel and almost eol) i've bought a bricked rt-ac56u hoping to revive it.

I've connected a serial console and the output is somehow encouraging but I've failed to make any ip connectivity.

What do you suggest I do next?

thanks in advance for any help !

Code:

boot_option=2
Decompressing...decompressLZMA: res=6
done


CFE version 2012.02.18 (r312294) based on BBP 1.0.37 for BCM95301X (32bit,SP,)
Build Date: Tue Jul 3 20:57:05 PDT 2012 (hwnbuild@xl-sj1-04)
Copyright (C) 2000-2008 Broadcom Corporation.

Init Arena
Init Devs.
Boot partition size = 262144(0x40000)
spiflash: found no supported devices
spiflash: found no supported devices
spiflash: found no supported devices
boot_option=2
otp_size: 0xbc
find_nvram: no nvram found
boot_option=2
otp_size: 0xbc
find_nvram: no nvram found
boot_option=2
otp_size: 0xbc
find_nvram: no nvram found
boot_option=2
otp_size: 0xbc
find_nvram: no nvram found
CPU type 0x0: 800MHz
Tot mem: 131072 KBytes

CFE mem: 0x00700000 - 0x007B0D68 (724328)
Data: 0x007496FC - 0x00749AD8 (988)
BSS: 0x00749AE8 - 0x0074AD68 (4736)
Heap: 0x0074AD68 - 0x007AED68 (409600)
Stack: 0x007AED68 - 0x007B0D68 (8192)
Text: 0x00700000 - 0x0074114C (266572)

Committing NVRAM...nvram_commit: Failed No valid nvram
done
flash0.0: Device not found
Loader:raw Filesys:tftp Dev:(null) File:flash0.os: Options:(null)
Loading: Failed.
Could not load flash0.os:: Network is down
CFE>
CFE> help
Available commands:

et Broadcom Ethernet utility.
show clocks Show current values of the clocks.
nvram NVRAM utility.
reboot Reboot.
flash Update a flash memory device
batch Load a batch file into memory and execute it
go Verify and boot OS image.
boot Load an executable file into memory and execute it
load Load an executable file into memory without executing it
save Save a region of memory to a remote file via TFTP
ping Ping a remote IP host.
arp Display or modify the ARP Table
ifconfig Configure the Ethernet interface
help Obtain help for CFE commands

For more information about a command, enter 'help command-name'
*** command status = 0
CFE> show clocks
Current clocks: 800/400/400/100 Mhz.
*** command status = 0
CFE> nvram show
pmon_ver=CFE 2012.02.18 (r312294)
size: 54 bytes (32714 left)
*** command status = 0
CFE> et -i=eth0 up
*** command status = -6
CFE> ifconfig eth0 -addr=192.168.1.1 -mask=255.255.255.0
Could not activate network interface 'eth0': Error
*** command status = -1
CFE> ping 192.168.1.1
Could not transmit echo request
192.168.1.1 (192.168.1.1): 0 packets sent, 0 received
*** command status = 1
CFE> show devices
Invalid command: "devices"
Available "show" commands: clocks

*** command status = -1
CFE> ifconfig
Network interface has not been configured
*** command status = 0
Sponsor
gallo
DD-WRT User


Joined: 07 Nov 2008
Posts: 142
Location: Spring Hill, Fl

PostPosted: Sat Feb 17, 2018 20:18    Post subject: Reply with quote
https://wiki.openwrt.org/toh/asus/rt-ac56u
_________________
modem: arris tm1602
router: r7800 voxel 1.0.2.77sf w/ kamoj 5.3b12 addon
ap: wrt1900ac v1 bs 43136,dir-825 b1 bs41117
NAS: Iomega ix2-200 CE 4tb, Seagate 1tb usb drive
Wash your hands and DONT TOUCH YOUR FACE!!!
maurer
DD-WRT User


Joined: 22 Jun 2009
Posts: 104

PostPosted: Mon Feb 19, 2018 10:13    Post subject: Reply with quote
no luck with recovery.
that's the first thing i've tried.
i've posted the same issue on snbforums and lynksysinfo
http://www.linksysinfo.org/index.php?threads/help-recovering-bricked-rt-ac56u.74040/
https://www.snbforums.com/threads/help-recovering-bricked-rt-ac56u.44714/
ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2318
Location: Canada

PostPosted: Wed Feb 21, 2018 3:15    Post subject: Bricked Reply with quote
These things are really hard to brick fully. I would suggest getting a USB-TTL device, such as this: https://www.adafruit.com/product/954

Then you will be able to read what the router is doing what it is looking for. TFTP is the best way to recover Asus router's. Their built in CFE recovery page has only ever caused me headaches. I usually end up sending a command via serial to force the router to look for a file, send the file using TFTP32 (client mode). Then wait, and wait, and wait. I once had to leave the thing for almost an hour before it finished flashing. I did not even lose my dd-wrt settings. Note, I have an Asus N66U.

_________________
Before asking a question on the forums, update dd-wrt: Where do I download firmware? I suggest reading it all.
QCA Best WiFi Settings


Some dd-wrt wiki pages are up to date, others are not. PM me if you find an old one.

Atheros:
Netgear R7800 x3 - WDS AP / station, gateway, QoS
TP-Link Archer C7 v2 x2 - WDS Station
TP-Link TL-WDR3600 v1 - WDS Station
TP-Link 841nd v8 - NU
D-Link 615 C1/E3/I1 x 7 - 1 WDS station
D-Link 825 B1 - NU
D-Link 862L A1 x2 - WDS Station
Netgear WNDR3700v2 - NU
UBNT loco M2 x2 - airOS

Broadcom
Linksys EA6400 - Gateway, QoS
Asus N66U - AP
Netgear WNDR3700v3 - not used
MediaTek
UBNT EdgeRouter X - switch
Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7209
Location: Columbus, Ohio

PostPosted: Wed Feb 21, 2018 10:49    Post subject: Re: Bricked Reply with quote
ian5142 wrote:
These things are really hard to brick fully. I would suggest getting a USB-TTL device, such as this: https://www.adafruit.com/product/954

Then you will be able to read what the router is doing what it is looking for. TFTP is the best way to recover Asus router's. Their built in CFE recovery page has only ever caused me headaches. I usually end up sending a command via serial to force the router to look for a file, send the file using TFTP32 (client mode). Then wait, and wait, and wait. I once had to leave the thing for almost an hour before it finished flashing. I did not even lose my dd-wrt settings. Note, I have an Asus N66U.


He already did that. Lol

_________________
I am far from a guru, I'm barely a novice.
ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2318
Location: Canada

PostPosted: Wed Feb 21, 2018 12:47    Post subject: Serial command Reply with quote
It is a matter of finding the correct serial command. The issue that I see is that it can not find the nvram, that is not a good sign.
_________________
Before asking a question on the forums, update dd-wrt: Where do I download firmware? I suggest reading it all.
QCA Best WiFi Settings


Some dd-wrt wiki pages are up to date, others are not. PM me if you find an old one.

Atheros:
Netgear R7800 x3 - WDS AP / station, gateway, QoS
TP-Link Archer C7 v2 x2 - WDS Station
TP-Link TL-WDR3600 v1 - WDS Station
TP-Link 841nd v8 - NU
D-Link 615 C1/E3/I1 x 7 - 1 WDS station
D-Link 825 B1 - NU
D-Link 862L A1 x2 - WDS Station
Netgear WNDR3700v2 - NU
UBNT loco M2 x2 - airOS

Broadcom
Linksys EA6400 - Gateway, QoS
Asus N66U - AP
Netgear WNDR3700v3 - not used
MediaTek
UBNT EdgeRouter X - switch
Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7209
Location: Columbus, Ohio

PostPosted: Wed Feb 21, 2018 13:00    Post subject: Reply with quote
Yes but you told him to buy a usb-ttl adapter when by his post it was already clear he had one hooked up and posted the output.
_________________
I am far from a guru, I'm barely a novice.
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