This directory provides installer images in the form of a device-specific part (containing the partition table and the system firmware) and a device-independent part (containing the actual installer), which can be unpacked and concatenated together to build a complete installer image. The device-specific part is named firmware..img.gz and the device-independent part is named partition.img.gz. In addition to providing several firmware..img.gz files for a number of devices with device-specific system firmware, we also provide a firmware.none.img.gz file (containing the partition table but without any system firmware) to provide generic installer images for devices for which no firmware..img.gz file is provided. To create a complete image from the two parts on Linux systems, you can use zcat as follows: zcat firmware..img.gz partition.img.gz > complete_image.img On Windows systems, you have to first decompress the two parts separately, which can be done e.g. by using 7-Zip, and then concatenate the decompressed parts together by running the command copy /b firmware..img + partition.img complete_image.img in a Windows CMD.exe window.