How to flash an iphone 4s free?

My 4s updated itself to 6.1.3 and crashed during the upgrade after that I kept getting errors when I tried upgrading it again, the technicians in a cell phone store said the board had crashed and I need to flash the phone to make it work again, could some one explain in detail what flashing is and what is pageplus and metro and also is there a free way to flash the iphone 4s

Put it on iTunes and it should restore to the latest version for free
else
Take it to the apple store Gurus and ask (aka politely demand) that they repair it, as Apple's update broke it.

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