Do i need to update software when i receive to update and is it can makhe my device out of service

Do i need to update software when i receive to update and is it can make my device out of service it happened before

my previous iphone 4 was not been jailbroken but after a year i did updated the software and my device shown blank on the screen, then when people called me that was ringing but my end shown nothing means no ringing and totally blank on the screen,no ringing and cannot been switch off and on the device.it continous happen between 3-5 month after i updated the new version software which shown on my device at setting mode.Now i really can't stand anymore i got no choice then i need to change to iphone 5.Now my question with this new device i bought in malaysia with no jailbroken do i compulsory to updated software on my new iphone 5 that now shown on my device at my setting mode.Please advice me what i need to do to make my live easy because i dont want to reformat my device as previously and as a result everything i kept in my device was gone.Waiting for your reply urgently.THANKS

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