Upgrade O.MG Cable Firmware in Ubuntu GNU/Linux

The O.MG Cable is a popular tool for security professionals and enthusiasts, offering a covert way to gain access to a target device. To ensure its optimal performance and take advantage of new features and security enhancements, it’s important to keep the firmware up to date. In this blog post, we will guide you through the process of upgrading the firmware of an O.MG Cable on a GNU/Linux Ubuntu system using a set of simple commands.

Step 1: Installing pySerial

The first step is to install the pySerial library, which allows communication with serial ports. Open a terminal and execute the following command:

sudo pip3 install pyserial;

This command will install pySerial and its dependencies on your system. You may be prompted to enter your password to proceed with the installation.

Step 2: Cloning the O.MG-Firmware Repository

Next, we need to obtain the O.MG-Firmware repository from GitHub. Change to the desired directory in the terminal and execute the following command:

git clone;

This command will create a local copy of the O.MG-Firmware repository on your machine.

Step 3: Navigating to the O.MG-Firmware Directory

Change into the newly created O.MG-Firmware directory by running the following command:

cd O.MG-Firmware/;

This command ensures that you are in the correct directory to proceed with the firmware upgrade.

Step 4: Plugging in the O.MG Cable

Before flashing the firmware, plug in the O.MG Cable to your computer’s USB port. Ensure that the cable is properly connected and recognized by the system.

Step 5: Flashing the Firmware

To initiate the firmware upgrade process, execute the following command:

sudo python3 ./;

This command triggers the firmware flashing script using Python 3 and grants it the necessary privileges to access the USB port. You may be prompted to enter your password.

You will see progress updates and notifications on the terminal during the flashing process. Do not disconnect or interrupt the cable while the firmware is being flashed.

Once the flashing process completes, the O.MG Cable will install the latest firmware, ensuring optimal performance and security.

Conclusion: In this blog post, we provided a step-by-step guide on upgrading the firmware of an O.MG Cable on a GNU/Linux Ubuntu system. By following these commands, you can keep your O.MG Cable up to date, benefit from new features, and enhance its security. Remember to exercise caution during the firmware flashing process and avoid interrupting it. Enjoy exploring the capabilities of your upgraded O.MG Cable!

How to Use Gmail to Send Email with Postfix on Ubuntu


In today’s digital age, email has become integral to our personal and professional lives. While numerous email clients are available, Gmail remains a popular choice due to its user-friendly interface and powerful features. In this blog post, we will guide you through configuring Postfix, a famous mail transfer agent (MTA), to send emails using your Gmail account on an Ubuntu system. Let’s dive in!


Before we begin, make sure you have the following prerequisites in place:

  1. An Ubuntu system with administrative privileges.
  2. A Gmail account.
  3. A basic understanding of the Linux command line.

Step 1: Install Postfix

  1. Open the terminal on your Ubuntu system.
  2. Update the package lists by running the command:
sudo apt update;

Install Postfix by running the command:

sudo apt install postfix;

During the installation process, you will be prompted to configure Postfix. Select “Internet Site” and press Enter. Provide your system’s mail name when prompted.

Step 2: Configure Postfix to Use Gmail

Open the main Postfix configuration file using a text editor:

sudo nano /etc/postfix/;

Locate the following lines and modify them as shown below:

relayhost = []:587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous

Save the changes and exit the text editor.

Step 3: Configure Gmail Account Credentials

Create a file to store your Gmail account credentials:

sudo nano /etc/postfix/sasl_passwd;

Add the following line to the file:

[]:587 [email protected]:your_app_password

Note: Replace “[email protected]” with your actual Gmail address and “your_app_password” with the application-specific password you generated for Postfix in your Google Account settings. Save the file and exit the text editor. Secure the credentials file by running the command:

sudo chmod 600 /etc/postfix/sasl_passwd;

Update the Postfix lookup table for the credentials file by running the command:

sudo postmap /etc/postfix/sasl_passwd;

Step 4: Restart Postfix and Test

Restart the Postfix service to apply the changes:

sudo systemctl restart postfix;

Test the email configuration by sending a test email using the following command:

echo "This is a test email." | mail -s "Test Email" [email protected];

Note: Replace “[email protected]” with the email address where you want to send the test email.

Check the recipient’s mailbox to ensure the test email was delivered successfully.


By configuring Postfix to use Gmail on your Ubuntu system, you can harness the power of both platforms to send emails seamlessly. This integration allows you to leverage Gmail’s advanced features while benefiting from Postfix’s reliability and customization options. With the steps outlined in this blog post, you can easily set up the connection and streamline your email communication. Happy emailing!

Bulk convert PNG images to JPG / JPEG

for i in *.png ; do convert "$i" "${i%.*}.jpg" ; done

The command “for i in .png ; do convert “$i” “${i%.}.jpg” ; done” is a Bash script that converts all PNG files in the current directory to JPEG files.

Let’s break down this command:

  • “for i in *.png ;” is a loop that iterates over each PNG file in the current directory.
  • “$i” is the name of the current PNG file being processed.
  • “convert” is a command-line tool that is part of the ImageMagick software suite. It is used for image conversion, resizing, and manipulation.
  • “${i%.}.jpg” is the new filename that the PNG file will be converted to. The “${i%.}” syntax is used to remove the file extension from the original PNG file name, leaving just the base filename, which is then followed by “.jpg” to indicate that the new file should be a JPEG file.

In summary, this command converts each PNG file in the current directory to a JPEG file with the same base filename. For example, “example.png” would be converted to “example.jpg”. This command can be useful when you have a large number of PNG files that you need to convert to JPEG format quickly and easily.

How to monitor all outgoing requests/connections from your GNU/Linux machine

netstat -nputw;

The “netstat” command is a network utility tool used to display information about active network connections, including the protocol used (TCP or UDP), the local and remote addresses and port numbers, and the current state of the connection.

The options used in this command are as follows:

  • “n” displays addresses and port numbers in numerical form rather than converting them to hostnames and service names.
  • “p” shows the process ID (PID) and program name using the connection.
  • “u” displays UDP connections.
  • “t” displays TCP connections.
  • “w” displays raw sockets.
  • “;” separates the command from other commands that may follow.

Therefore, the command netstat -nputw; will display all current network connections on the machine, including the corresponding processes and raw socket connections, in a numerical format without resolving hostnames and service names.