how to root zte z557bl?

i am currently seeking help on how to root my zte z557bl phone (tracfone) .
the information i get while in the "android recovery" screen (power off, vol. up+power button) is as follows
i do not wish to brick my phone, i had that happen to one of my older phones. if you have used a rooting process that works for a zte z557bl phone, or one that know of, please provide that.

thank you


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