iPhone 5S blue screen reboot loop iOS 8.4

Hello everyone,

I bought my iPhone 5S when it had released. Everything worked ok, there were no problem with it.

Four months ago, in April, a weird blue screen appeared on my device. Then, immediately, y restored and updated. The problem wasn't there, it disappeared....till now.

That's what happened...I was using my iPhone as others days, when that blue screen appeared (again). The iPhone powered off. I tried to power on my device, but when in the apple boot logo, the blue screen went out again to restart the iPhone. It can't be powered on, the blue screen was always there.

So I tried to restore like the other time it happened, now in DFU mode (cause I can't power it on). But when the progress bar is loading the software (yes, WHEN it's loading), that ... blue screen appears again. I can't restore neither update. Don't know what to do! Help Please! Thanks.

iPhone 5S (iPhone 6,2) 32Gb Gold, Model A1457. Of course, it hasn't been jailbroken never.

Thank you again.