A computer-implemented method for updating system-level services within read-only system images may include (1) executing, during initialization of a mobile computing device, an update service stored within a read-only system image located on the mobile computing device, (2) identifying, via the update service, a writable partition located on the mobile computing device, (3) identifying, via the update service, a digitally signed update within the writable partition for at least one system-level service stored within the read-only system image, and (4) executing, via the update service, the digitally signed update within the writable partition instead of the system-level service stored within the read-only system image. Various other methods, systems, and computer-readable media are also disclosed.
