Out of curiosity, did this update get pulled? I purchased a ZMax Pro on the 10th, to replace my Nexus 5, which developed a sudden hardware fault. The first thing I did after the T-Mobile rep activated my phone was to check for firmware updates.
After having found the info posted on T-Mobile's website, which stated that the update was set for a staged delivery ending on the 19th (if memory serves). I still haven't received the update. I pulled my micro sd, and performed a factory reset. The phone is still sitting on firmware TMO_Z981V1.0.0B04, with no updates available. I've attempted with WIFI on and off, though it shouldn't have any bearing, with such a small file size (My N5 wouldn't download updates greater than a certain size unless I was actually on WIFI).
While I don't mind the software being a little out of date, and I don't expect worlds out of this phone like I did my N5, I would prefer to keep it up to date, and to see if the updated firmware fixes the graphic glitches I run across from time to time, since ZTE has made it so that I can't update my own device.
I don't mean to come across as ignorant or anything, I know the software engineers handle the actual updates, but a little information goes a long way. One page shows version B02, one page shows B07, the software updates page does not even show the ZMax Pro (or apparently any ZTE device).. It's all a little confusing, and disheartening, considering I didn't lease the phone and paid cash in full.