i also have a zte and it's the down volume button + power button at the same time.
Hold power button and volume down keys for a second or two. Just figured it out myself after trying every combination and this on the zte warp 4g on boost.
Thanks that did work. You're awesome. Power button and volume down works tea.
Holding the power and volume down @ the same time is the correct answer
im just gonna leave it at we have no screenshot option. all of us are told the same thing and it hasnt worked for any of us...