If you are still in gb just connect your Neo V to your pc via usb, (let it install pc companion, if you haven't already), run pc companion and it will find a new firmware version. Do the update. The last official update is .587.
Neo V isn't officialy supported anymore. So, .587 will be the last one and there won' t be any official JB update.
You can only find some custom ROMS around, if you are interested in the JB feel.
Of course, this needs rooted device and sometomes unlocked bootloader.