Phantom 3 - Cannot update Firmware, Aircraft and remote will connect

I recently purchased a Phantom 3, second hand but rarely flown. It needed firmware updates. Cannot get the firmware to update on the aircraft. Now remote and aircraft will not connect. New to drones and quite frustrated. Can anyone offer advice?

Have you
flown it yet?..If ever thing works ok / normal don’t do a update…sometimes its best to leave well enuff all alone…I have not UPdated my P3 SE for near 3 years and everything’s just fine…i’ve read lots of stories on "Phantom of up dates really messing things UP…Did you get the operators manual with it ?