Turn on the console. Most modern chips boot into a safe interface (like XeniumOS).

Flash ROM Image (commonly called a BIOS) is the foundational firmware that initializes Xbox hardware and boots the system. While a standard PC BIOS primarily manages hardware communication, the Xbox version also contains the system kernel in a compressed and encrypted format. xboxdevwiki Core Purpose & Functionality Initialization

When searching for an follow these safety guidelines to protect your PC and console:

Transfer your downloaded .bin or .bios file to the console's C: or E: drive via FTP, select it in the tool, and execute the flash. Method B: Modchip Flashing

Stock consoles restrict you to the original, small hard drive (8GB to 10GB). A custom BIOS allows you to install modern SATA drives up to 2TB or more using an adapter.