Recovering a bricked Beetel 220BX ADSL Router / Modem

Either the BSNL wiring to my house is faulty or I'm very [un]lucky, eitherway my BSNL modem / router gets fried every three months or so. Instead of buying a new device each time, I have turned to used devices which I can get for about Rs 100 shipped from eBay after coupons.

So I bought a used Beetel 220BX which arrived in a not-so bad physical condition, I kept it aside to be used when my current modem fails. It was only when I tried to configure it two months later that I realized the modem was faulty.


Initial observations

  • Powers on.
  • Power and Link LEDs are solid even without the DSL cable.
  • PC/USB LED glows when an ethernet cable is attached.
  • Does not respond to a DHCPDISCOVER, DHCP server doesn't appear to be running/enabled.
  • Assigned an IP address in the subnet to a PC directly attached to the device, does not respond to ping, web interface is not accessible. An nmap scan shows no active services listening on any port.
  • Tried pressing and holding the reset button for well over 2-3 min, but no difference.

So it became perfectly clear that the device is either severely bricked or simply dead. As I didn't want to just trash the device, I opened the device and was happy to see that there was an easily accessible serial port. Connected my serial adapter using the wire tester hooks and I was looking at the serial output in no time. The pins are GND-TX-RX-VCC from the bottom.

The serial output had lot of SQUASHFS errors and it looked like the filesystem got corrupt somehow. Full boot log here.

BusyBox v1.00 (2006.06.14-14:54+0000) Built-in shell (msh) Enter 'help' for a list of built-in commands.

Loading drivers and kernel modules...

CodeReal: invalid data

SQUASHFS error: lzmafs error while decompressing! SQUASHFS error: Unable to read page, block 10a9c1, size 5379
CodeReal: invalid data
SQUASHFS error: lzma
fs error while decompressing!
SQUASHFS error: Unable to read page, block 10a9c1, size 5379

There is an option to interrupt the boot process which would drop you in a CFE shell. CFE acts like a boot loader and the limited shell gives you the option to flash a firmware from a TFTP server. Now all I had to do was to find the right firmware for my modem and flash away (or I thought). Luckily Shanker Balan had uploaded the firmware image for this modem on his site.

While researching more, I came across two excellent articles which proved to be invaluable in getting my modem fixed. Thank you mrmt32!

Only after reading those articles I realised that I cannot directly flash the image file as it contained three components ie CFE + Kernel + Filesystem and the CFE firmware flash tool was expecting an image file without the CFE component. I used mrmt32's tool to create an image in the right format for the Beetel 220BX. Here is the final image file, ready to flash.

Now, all you need to do is setup your TFTP server on a PC, assign the PC an IP address in the subnet. From the CFE shell, run the flashimage command.


Loading ... Finished loading 1817620 bytes

That's it, type reset and your modem should now boot cleanly. Here is a boot log after flashing the firmware.

Find Google Analytics account associated with a tracking code

Few weeks back while I was making some changes to an old website, I noticed it was setup with Google Analytics but couldn't find the site configured in any of my accounts (well, the ones that I could of think of at the time). Luckily I was able to identify the account with Google's help.

Finding and regaining access to the account is a manual process. Support for Google Analytics is handled by the Google AdWords team so you need an AdWords account to contact them. If you do not have an AdWords account, simply sign up for one. You do not have enter any billing information.

Head over to the contact page for AdWords and choose the email option (or which ever option you'd prefer). Select Google Analytics, fill in the necessary details and describe the issue. Don't forget to include the tracking code. You should get an email response from a Google specialist within a day or two with the next steps.



Ideally, you would need to contact the administrator, but in your case, I understand that you're unable to place them - and for security reasons, we're unable to disclose administrator information to you. What I can do to help you is write on your behalf to the current administrator/s on this Analytics account, requesting them to get in touch with you.

If you would like me to go ahead and do this, please reply to this email stating so, as this will be the first step.

Next steps

In case this doesn't help and we don't hear back from the administrator (within 7 days from when I write to them), I will share with you the steps to prove ownership of the domain(s) being tracked by this account, and thus gain access to the account independently of the administrator(s).

In my case, it was a Google account that I had forgotten about (created when my Google Apps account got transitioned to the new system back in 2011) so was able to reset the password easily and regain access. It was good to know that I could also regain access by proving domain ownership.

Seagate GoFlex Net : Installing Rescue System

After installing Debian using the install script on Jeff Doozan’s page, the stock PogoPlug OS fails to boot on a GoFlex Net even though it works perfectly on a Dockstar or PogoPlug Device. So the alternative is to install Jeff’s Rescue System on the GoFlex Net, but the default installation fails to boot as well and requires a slight modification for it to work properly.

First boot into debian from a USB device and run the following commands

cd /tmp  
chmod +x  

Once the installation is complete, run the following command

fw_setenv rescue_bootcmd 'if test $rescue_installed -eq 1; then run rescue_set_bootargs; nand read.e 0x500000 0x100000 0x400000; bootm 0x500000; else run pogo_bootcmd; fi'

After this you can shutdown the device, remove the USB drive and restart, it will successfully boot into the rescue system.

You can also load the Rescue System from a USB drive (you need console access), thanks to Johannes. For this you need to download the rescue system from here and put the files on the root directory of a FAT formatted USB drive.

Now you need to interrupt the boot process through the console by pressing a key when prompted. You can either use a serial adapter or netconsole (provided you have set it up already)  for this.

U-Boot 2010.09 (Oct 23 2010 - 11:53:10)  
Marvell-GoflexNet by Jeff Doozan, Peter Carmichael  
Hit any key to stop autoboot:  0

Once you have interrupted uBoot and at the Marvell>> prompt, connect the USB drive and run the following commands

usb start  
fatload usb 0:1 0x500000 uimage  
fatload usb 0:1 0xe00000 uinitrd  
setenv bootargs console=$console $mtdparts  
bootm 0x500000 0xe00000

The rescue system now boots and you can re run the debian installer or do further troubleshooting.

Seagate GoFlex Net : Serial Connection

If your GoFlex Net is no longer booting cause you made some change you will probably need to establish a serial connection to troubleshoot the problem. For this you need a serial adapter, but the GoFlex Net uses 3.3 V TTL levels so do not connect your PC’s serial connector to the device as its 12 V.

To establish a serial connection you will need the following items

  1. USB Serial Adapter – You can get one from eBay based on the PL2303 or CP2102 chips.
  2. Wire Testing Hooks – You will need this to properly attach the cable to the pins.

IMG_0778You can also get a Nokia CA-42 data cable as the serial adapter but you will have to identify the correct wires etc which might be a little tricky.

On the left you can see how my adapter looked after attaching the hooks.

Now you need to open the GoFlex Net to get access to the serial port. For this you will need a plastic pry tool. Use the pry tool to slowly detach the bottom panel from the GoFlex. There are small clips which is holding the bottom panel.

Once you have removed the bottom panel, you will be able to see the 10 pin port as shown below.


Now use the cable hooks to attach the cables to respective pins and the final result would be something like below. It may take a while to attach the hooks properly as the pins are really close together.


Now attach the serial adapter to the PC, install the drivers and you are ready. If you are using Windows you can use Putty to see the serial output. Configure putty with correct COM port, speed as 115200 and no flow control.

serial-puttyNow start the Putty session and then power on the GoFlex Net, you should see the console output.

In linux you can simply run

screen /dev/ttyUSB0 115200

From there you can interrupt uBoot to fix any issues with the uBoot environment for instance. But be careful as you don’t want to brick the device by messing too much with the boot loader and you will probably need a JTAG to recover the device if its bricked.

Boot debian from SATA - Seagate GoFlex Net

This how-to assumes that you have a working Debian installation on a USB drive. If not check Jeff’s site on how to install debian Squeeze on the GoFlex Net.

Once you have installed debian and have verified everything is working fine, we can go ahead with the modifications. It would be a good idea to configure netconsole so that you can monitor and make changes to uBoot if there is any problem. The steps are described in detail here.

The default kernel installed doesn’t have support for the GoFlex Net SATA ports. So we are going to replace it with a newer and updated kernel.

Now we will download and install the updated kernel.


dpkg -i linux-image-

cd /boot

# Create the images for uBoot

/usr/bin/mkimage -A arm -O linux -T kernel -C none -a 0x00008000 -e 0x00008000 -n Linux- -d /boot/vmlinuz- /boot/uImage
/usr/bin/mkimage -A arm -O linux -T ramdisk -C gzip -a 0x00000000 -e 0x00000000 -n initramfs -d /boot/initrd.img- /boot/uInitrd

After that reboot GoFlex Net and ‘uname –r’ should show ‘’ if the kernel installation was successful. Once you have made sure it’s the updated kernel we can update uBoot environment to the new GoFlex Arch Number to enable the SATA ports.

setenv arcNumber 3089

Reboot again and check the output of ‘dmesg’, it should show something like this

[    1.068182] sata_mv sata_mv.0: version 1.28  
[    1.072505] sata_mv sata_mv.0: slots 32 ports 2
[    1.079814] scsi0 : sata_mv
[    1.083250] scsi1 : sata_mv
[    1.086582] ata1: SATA max UDMA/133 irq 21
[    1.090697] ata2: SATA max UDMA/133 irq 21

Now you can modify the uBoot environment again to make it boot from a SATA drive.

fw_setenv sata_boot 'ide reset; mw 0x800000 0 1; ext2load ide 0:1 0x800000 /boot/uImage; if ext2load ide 0:1 0x1100000 /boot/uInitrd; then bootm 0x800000 0x1100000; else bootm 0x800000; fi'  
fw_setenv sata_bootcmd 'run usb_set_bootargs; run sata_boot'  
fw_setenv bootcmd 'usb start; run force_rescue_bootcmd; run ubifs_bootcmd; run usb_bootcmd; usb stop; run sata_bootcmd; run rescue_bootcmd; run pogo_bootcmd; reset'

Shutdown the GoFlex Net, connect the hard disk to the *right* side SATA port. There seems to be a bug in Jeff’s uBoot for GoFlex Net, so within uBoot only the right port works. That would be all and the GoFlex Net should now boot from the attached SATA disk.

Here are the logs from a successful SATA boot.

And my uBoot environment settings as well.

If you do not have a GoFlex Hard Disk, you can attach an external eSata disk to the GoFlex Net using these cables.

If you are having any trouble setting this up, leave a comment.

How-To Configure Seagate FreeAgent Dockstar as a 3G Gateway

This how-to explains how to configure a Seagate Dockstar running Debian to establish a 3G connection using a USB data card like the Huawei E122 / UMG181 etc and configure it to act as a gateway so that the internet can be shared with the other devices connected to the network.

You need to have a Dockstar running Debian, if not check Jeff's site on how to install Debian on your Seagate Dockstar.

Configuring the USB Modem and PPP Dialler

First install the following packages using apt-get

  1. usb-modeswitch
  2. usb-modeswitch-data
  3. ppp
apt-get install usb-modeswitch usb-modeswitch-data ppp

After that connect your 3G USB modem, and wait for few seconds. After that give the command 'dmesg' and check if you can see something like this

option 1-1.4:1.0: GSM modem (1-port) converter detected usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB0 option 1-1.4:1.1: GSM modem (1-port) converter detected usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB1 option 1-1.4:1.2: GSM modem (1-port) converter detected usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB2 option 1-1.4:1.5: GSM modem (1-port) converter detected usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB3

If you see similar lines saying 'modem attached to ttyUSBx', then the USB modem is detected fine.

Now edit the file '/etc/ppp/peers/provider' and replace its contents with the following

holdoff 10  
lcp-echo-failure 2  
lcp-echo-interval 5  
maxfail 0  
connect "/usr/sbin/chat -v -f /etc/chatscripts/BSNL3G"

After that edit the file '/etc/chatscripts/BSNL3G' and replace its contents with the following

'' 'ATZ'  
'OK-AT-OK' 'ATZ'  
#'OK' 'ATZ'
#'OK' 'ATQ0 V1 E1 S0=0 &C1 &D2'
OK AT\^SYSCFG=14,2,2780380,0,1  
'OK' 'AT+CGDCONT=1,"IP","bsnlnet"'  
'OK' 'ATDT*99#'  

Now if everything works as expected you should be able to connect by giving the command 'pon'. Try pinging to verify if the internet is working. You can disconnect by giving the command 'poff'

To make the dock connect to the internet automatically on start-up, append the following to the '/etc/network/interfaces' file

auto ppp0  
iface ppp0 inet ppp  
provider provider

Reboot the Dockstar to verify if everything is working fine.

Configuring the Dockstar to act as a Gateway

If you do not have iptables installed, install it with the following command

apt-get install iptables

Now edit '/etc/sysctl.conf' and change the line that says 'net.ipv4.ipforward = 0' to 'net.ipv4.ipforward = 1' and also make sure that the line is uncommented.

After that execute the following commands

/sbin/iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE  
/sbin/iptables -A FORWARD -i ppp0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables -A FORWARD -i eth0 -o ppp0 -j ACCEPT

Now we need to get these rules loaded at boot time, for that follow the steps below

iptables-save > /etc/firewall.conf

Edit the file '/etc/network/if-up.d/iptables' and add the following

iptables-restore < /etc/firewall.conf

Next step is to make the file executable

chmod +x /etc/network/if-up.d/iptables reboot

That's it, now your Seagate Dockstar will act as a gateway and you can share your 3G internet connection with the other devices on your network. Make sure you manually set the Gateway IP address to that of the Dockstar in each device.

If there is any problem leave a comment.