Support Am I the only one who can't root my ZTE-Z990 (AT&T Avail)?

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http://androidforums.com – I've tried the sticky at the beginning of this forum as well as a plethora of other methods. Lost count of how many times I had to restore my phone to factory defaults. I think where I went wrong was after buying the phone in April or May, I accepted one of AT&T's software updates. Can anyome please help me with this? Phone info is as follows: Model Number: XTE-Z990 (AT&T Avail) Android Version: 2.3.4 Baseband Version: Z990B01 Kernel:2.6.35-perf+zte-kernel@Zdroid-SMT Build Number: Z990V1.0.0B19 MUCH THANKS IN ADVANCE. THIS PHONE COMES WITH SCANT LITTLE INTERNAL MEMORY (General)