Select your ReadyNAS's firmware:

    ReadyNAS OS 6 (ARM)

    Add-Ons for ReadyNAS devices running ReadyNAS OS 6 and using the ARM architecture. (RN102 / RN104 / RN204 / RN2120)

    ReadyNAS OS 6 (x86)

    Add-Ons for ReadyNAS devices running ReadyNAS OS 6 and using the x86 architecture. (RN312 / RN314 / RN316 / RN516 / RN716x / RN3220 / RN4220)