Problem during root !!!!! Help

[Lefwan]

Hi guys,
I have a a MZ601 with android 4.0.4... I tried to rooted using a root application apk that doesn't need a PC.
but after restart the MZ601, it is blocked on the 1st screen with Motorola LOGO ...
Please help guys,
explain to me step by step how to solve this problem !!!

Thanx in advance