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6f. Latest release for the Ambit 200


The following screen shots and text were put together by




SIGMA X2 Build 125 *CRACKED*

Ambit 200 Tutorial



There are 2 methods to flash this image onto your 200, the first is via a Blackcat cable (JTAG). If you are familiar with JTAG/Blackcat then you need no detailed instruction as you should already know what you are doing. Just write the included sigmax2_125_cracked_dump.bin file onto the flash using the 'Write All' function in SchwarzeKatze. The other method is by using a serial connection and a max232/3 interface; this method will be explained below.


ALERT: If you already have the older SigmaX on your 200 and have no JTAG interface then you cannot flash this image onto your modem. Even the Sigma bootloader that allows flashing is buggy, if you try to use this Sigma flash menu you will brick the modem. Look at the end of this tutorial for a way to restore a compatible bootloader so you may flash the new image correctly.



Flashing the SIGMAX2 image onto the 200

Connect your modem to your PC using a MAX232/3 interface

Connect the modem to the PC via an Ethernet cable

In Windows Networking set the network adaptor connected to the modem to a manual configuration with these details:


IP Address:

Subnet Mask:

Gateway: <don't enter anything>

DNS: <don't enter anything>


Open up HyperTerminal or Tera Term using the following parameters:


Baud Rate: 115200

Data Bits: 8

Parity: None

Stop Bits: 1

Handshaking: None


Now power up the modem and press 'p' in the terminal window quickly.


Enter the for the Board IP Address, just press return for the other values.






After entering this data you should be presented with the flash menu.


At this point, start the tftpd32 program that came with this archive.

Make sure that is present in the Server Interfaces box.

My example shows the Current Directory as C:\temp but of course this is only an example, don't take it literally. Make sure the Current Directory is set to the same place you extracted this archive. You have to click the Settings button to change this.





Now select 'd' from the menu options in the terminal window and enter for the Board TFTP Server IP Address and sigmax2_125_cracked_dump.bin for the TFTP filename.


The modem should now read the firmware image. You will be informed that the image does not have a standard header and asked if you still want to store it. Reply with yes.


You will then be asked the sector at which to start the store. Enter 0.


It will then start to flash the chip with the new firmware. When it's finished, it will ask you to store parameters to flash, enter no.




You will then be returned to the main menu. You may now reboot the modem. The new Sigma firmware should start to boot. Lots of data will flash past you on the terminal until you reach the scanning stage.


At this point you may now start to enter the settings for your area. Firstly however, you should stop the channel scan to make it easier to see what you are doing. To do this type in the following commands


cd /cm_hal



The channel scan should then stop. Now, enter your settings.


cd /non-vol/halif

mac_address 1 aa:bb:cc:dd:ee:ff (change this to a valid mac)

cm_tuner 14


cm_annex 3 (pure NTL areas ONLY should enter this)

cd ../docsis

ds_frequency 402750000 (change this your area's DS frequency)


If you want to force the 10Mbit configuration file (which you probably do) then enter the web configuration page ( ) and enter into the Config name: box and click the change box next to it.

You can enable telnet using this interface too, as well as change the MAC address or change the firmware. If you enable telnet, make sure you change the username and password.

Now commit these changes to flash by entering the single command:




That's it! Reboot the modem and you should be all up and running.


Have fun,


PS. If the modem ever stops working, you can clear it by entering these commands.


cd /event


cd /non