S4 mini that wont boot...please help

[AC Question]

Yesterday I went to wake up my Samasung S4 mini after ie being in my pocket to find that it would not respond to a press of the home or power keys. I took the battery out and now it is stuck in a boot loop. I have tried doing a factory reset but once the data is wiped abd you select it to reboot it says error under the robot and goes back into the boot loop. Please help me I'm at a loss with what else to try except a large hammer.