Was Storage really ever enabled? all nrf51 board have SAVE_ON_FLASH flag which disables storage module (and many others). nrf51 has only 256KB of flash so it is almost impossible to fit even basic stuff. Check this conversation http://forum.espruino.com/conversations/332766/#14694853 it can be done by disabling something else, e.g. GRAPHICS module. You don't appear to have any modules enabled in your 2v04 build, is this some custom build?
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Was Storage really ever enabled? all nrf51 board have SAVE_ON_FLASH flag which disables storage module (and many others). nrf51 has only 256KB of flash so it is almost impossible to fit even basic stuff. Check this conversation http://forum.espruino.com/conversations/332766/#14694853 it can be done by disabling something else, e.g. GRAPHICS module. You don't appear to have any modules enabled in your 2v04 build, is this some custom build?