Various embodiments herein each include at least one of systems, methods, and software for SST secure boot device order modification. One such embodiment, in the form of a method performed by a server, includes, receiving a request from a mobile device app to modify a boot order of a computer controlling operation of an SST. The method proceeds by authenticating the request. When the request is authenticated, the server performing the method then sends a command to the SST to modify the boot order of the SST.