I tried to update my unlocked iPhone on accident, now it won't even turn on

I have a iPhone 4 and I accidentally tried to update my iPhone when it had a full battery, but when it was starting to update it shut off. Now is dead & when I plug it in, it says its charging for like 2 sec. Then the apple logo pops for about 10 secs then shuts off then comes on, then shuts off!

This happened to me to if its unlocked there's nothing that can be done i even called apple it didn't work i had a proffesional shop tell me there was a 3% chance they could fix it. I had an iphone 4s 32gb they would give me 30 bucks so they could part it out sorry man i know it sucks and how it feels.

Your best bet is to plug it in to itunes, and click restore. Let it do its thing. If that doesn't work i'm not sure what will…