xzu hardbricked after trying to install a custom rom

My xzu was hard bricked while trying to install a custom rom. Had rokted my phone with no problems ,thnx to xda, now my phone c6802 is not booting at all, all it does is vibrates when i press the powet button ,no led light flashing nothing at all except vibrate. I tried the s1 tool using the test point on the motherboard but it always gave an error' resoirce msm8247 room nt found' finally i tried to go to service centre but they denied reparing it even when i was ready to pay for it. Guyz help me out here