you just flashed old flashfile with old imei
just try with new imei before doing hardware....
u need backup flashfile , select tht flashfile ......
1: change original imie 1 to new imie 1
2: change original imie 2 to new imie 2
3: it will rebuild a new flashfile renamed " rebuild_flashfile name"
4: select the new flash file and write it to phone .
check network and post result
if it still same its hrdwre!!