Install new ROM on the ZTE San Francisco / Problem

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http://forum.xda-developers.com – :confused::confused: Hi, I want to help please a tutorial explained how because I can not manage to install another rom! The problem is the following, do not know what is the program that Z4ROOT, I installed it and then I gave Permanent Root and restart the phone only when I give it root the phone Used Rom Manager and after restart I no longer go to Flash CWM Recovery installation to fail Root, please long who can help me to install another android platform on my ZTE Blade San Francisco, I do not mind but any version not go below 2.1 for this version I have currently :confused: (HowTos)