New rom don't recognize phone carrier

Hi there, I have installed the rom "[APR 7][ROM][KERNEL] SkyDragon | GPE - Lollipop 5.1 Official | v5.0 | 4.04.1700.4" and after installation my phone don't recognize the carrier, it recognize that some SIM card is in but I have no signal (an "x" appears on the signal bar).
What can be the problem?