Here's a simplified overview of the steps involved in updating a modded Xbox 360 console using J-Runner:
Obtain the original NAND and CPU key: It's important to have a backup of the original NAND firmware from your console, as well as the CPU key associated with it. These are crucial for creating a new NAND firmware.
Use J-Runner: J-Runner is a tool used for creating and managing NAND images for modded Xbox 360 consoles. Open J-Runner and load the original NAND dump. The tool should automatically recognize the console type (e.g., Xenon for older models).
Generate the new NAND image: In J-Runner, select the desired options, such as the latest dashboard
version, and click on "Create XeBuild Image." This process will generate a new NAND image with the chosen settings.
Flash the new NAND: Once you have the new NAND image, you can flash it onto the console using Xell, which is a bootloader. This process typically involves connecting your console to a PC and using Xell to flash the new firmware.
It's worth noting that modifying or updating the firmware of an Xbox 360 console, especially older models like Xenon, carries some risks and requires technical knowledge. It can potentially void warranties, lead to console bricking if not done correctly, or violate terms of service.