My phone keep restarting after install rom.

Hi there,
i have Huawei Ascent G700 - U10
so i root my device and install Custom Rom, after that my phone didn't see the two sim cards, so i install anther Custom Rom and i have the same problem, and then anther Custom Rom and then my phone keep reboot over & over again,
so plz. can any one help me to fix all that
thanks...... :(