I extracted PIT myself from 7.1.1 stock rom - British.
I downloaded rom from galaxy firmwares site.
First time I tried flashing this rom or German... I don't remember anymore, it went up to 90% and failed. It was only 1 file for AP
Edit:
If stock ota went to 6.0 how did I have 7.1.1 stock today

(I tried to root and bricked today)
Maybe if I flash your 5.0 or try to flash Austrian 5.0 with extracted PIT from that rom.
And then root it (I read it's easier to root this device lower then 7.0)
and then flash 6.0 + root again.
Since it's so hard to root it on 7.1.1 (idk why).
Many people had this problem on 7.1.1