iPhone 6 Plus Stuck in Boot logo
I have a problem with an iphone 6 plus.
It got the screen replaced several weeks ago (I don't know if this could be the issue or if it is just a coincidence) but few days ago the phone was off. when I tried to power it on, it goes to the white screen with apple logo for about 2 seconds and they the screen goes off (except the backlight that its still on and we can see it).
I have tried some reset through the keys combination but it didn't help.
I have connected it to itunes in DFU mode and I have tried to restore it.
When the progress bar starts to move, the itunes comes with error 9.
Does anyone know what could be the next steps to diagnose this problem?
Thank you very much in advance!