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I had a problem that let my phone in an infinite boot. It was the Facebook official app for Android...
I contacted with ZTE support and they told to me that the unique solution for that will be to make a 'factory reset' so I did it.
Then I remembered the Android 'Safe Mode' and found the solution for that "infinite boot"
When you get the 'infinite boot' you'll need to press your power button till ZTE Logo comes in, then, when Blade logo appears you'll press 'Volume -' button, then your phone will be booted in 'Safe Mode'... Then you'll open Settings > Default Apps > and choose in Launcher lash, Mi Favor. So you'll be able to access to Play Store, open it and uninstall the Facebook official app, then reboot your phone normally and it'll be ok without performing a factory reset.
Greetings from Ecuador ❤## # ********