Question about a 2000 kia sportage?????? please help?

[.................]

i have a friend that has a 2000 kia sportage tubocharged they put piston and rods but they didnt touch the heads, now his engine is broken it doesnt have any compression. what could it be??????
thanks for your help

[MERLIN]

sounds they broke rings on piston s or wrong pistons /or bent valves