This is a how-to for updating the BIOS of Dell Studio 15 Laptops without having Windows installed. It works with a Core i7 Studio 1557 but it will probably also work with other models - but be warned: It may brick your machine and if something goes wrong I will not take any responsiblity ... You're on your own.

My machine is Linux-only. BIOS updates for recent Dell Laptops unfortunately just come with a Windows Flash Tool (WinPhlash) which requires a native Windows installation in order to work.

My solution is a bootable FreeDOS USB Flash Drive containing all required BIOS files and tools to flash the BIOS without Windows.