IPhone won't turn on after iOS update?

I got a used iPhone and the first thing I did after I took it from the past owner was to update it to the last iOS version. But from that point, iPhone won't turn on. The silver apple just turns up on the screen and then disappears. It's like the iPhone tries to open but can't. Now it's got no battery but when I plug it in to my computer or to a plug, the silver apple appears and disappears. I don't know what to do! I searched the net and tried to put it in recovery or DFU mode, but can't. Any ideas?

Lel, bricked phone.
That's what happens when you buy used electronics. They're either stolen, broken or in bad condition.
By the way, a bricked iPhone needs to go to Apple for repair. And if it's not under warranty, sucks to be you.

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