If you updated your phone ,ZTE Blade using the update.zip given by ZTE and you want to root your phone now and can't find any solution ....you've came to the right place!
I also had the same problem last few weeks but i figured it out.....tried on my ZTE Blade and it's rooted now :D.It was posted by us on modaco.com.

 FOLLOW THESE STEPS-
1.Download this file CLICK HERE
2.Rename it to 'update.zip' [without the inverted commas]
3.Move it to the SD Card
3.Turn off your phone
4.Press and hold Volume UP Button+Home Button+Power Up Button
5.A menu will appear 
6.Scroll down to 'Apply update.zip from SD Card'
7.Press Back button
8.Wait for the process and now Reboot the phone
9.Download Root Checker Basic and Superuser from Play Store 
10.Open the Root Checker Basic and Tap Once at "Verify Root access"
11.A popup window will appear,touch on "Allow"
12.Congratulations!your device is rooted now!!
                                                     





NOTE-WE ARE NOT RESPONSIBLE FOR ANY DAMAGE CAUSED TO YOUR PHONE.

As with any process which involves tampering with your phone's firmware, rooting your device can have negative as well as positive consequences. Although it's unlikely, you could end up with a bricked and unresponsive handset -- so consider yourself warned. You'll also void your warranty.
Another thing to note is that this guide relates to the GT-i9505 with the Snapdragon 600 chipset, and not the octo-core variant. This process will also not work with S4 handsets which have the a software baseband ending in MDM. You can find out your baseband reference by going to Settings > More > About Phone. And finally, this guide assumes you're using Windows 7 on your PC.
FOLLOW THESE STEPS-
1.Backup your phone
2.Download Motochopper
3.Extract the files somewhere

4.Switch on USB Debugging by going into Settings>More>About Phone,Scroll Down to build number and tap it continuously ,this will enable Developer Menu which you will find in More of the Settings Menu. Go there and enable USB Debugging
5.Connect your phone using a USB Cable
6.Go to the folder where you have extracted the Motochopper and double click the 'Run' exe file
7.You will see a windows like this 


8.Press Enter and follow the instructions carefully and your phone will be rooted :)


Anyone who wants a detailed video guide can See Here(Click) <---Not my work :I,I don't own a Galaxy S4 :(


NOTE-WE ARE NOT RESPONSIBLE FOR ANY DAMAGE CAUSED TO YOUR PHONE.




This blog is currently under development,any quereis may be commented in a post...:)
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