Phone Storage Not Recognised correctly

I have a Blu Studio 5.0C HD running Android 4.4.2. The phone specs quote 4 gig of internal storage , however the phone itself ( and ES File Explorer ) report 2.34 GB. I don't have a LOT of apps installed , and those that can be moved to the SD card have been , but I'm running low on space ( Google aps won't update ). Is there something I can do ? My thought was a fresh re install ( which I want to avoid if possible ). TIA

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