Will apple charge me to reboot my iphone?

I found a smashed iphone 4 and i have been making it a pet project of mine to fix it up and use it as an ipod. I recently put a new battery in it and after a bit of a hassle it is now stuck on infinite recovery loop. Can i take it to the apple genius bar and have them restore it for me for free? Or will they charge me?

Added (1). Hugo: yes i have but i keep getting error 21, i tried putting it pwnd dfu but i can because if just goes straight to recovery mode

Have you tried to put it on dfu mode and restore with Itunes?

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