Originally Posted by Marco Dufal
Well, I apologize for being an idiot. That's what I get for trying to document a root procedure I did last year, from memory. I have several similar cheap tablets and I misremembered this one as being pre-rooted as I described.
I just re-flashed from stock and re-rooted it. Fortunately, I had left enough breadcrumbs on my computer that I was able to reconstruct the right procedure.
I will do another full run-through within the next few days as soon as I have some time, to make sure I have everything 100% straight, and will clean this up to update the OP. Meanwhile, if you're feeling brave, here's the notes I took as I did it:
Settings > About Tablet > tap build number until it says you are a developer
Developer options > switch On > OK
USB Debugging > OK
see "USB Debugging Connected" notification
Wait for "Allow USB debugging?" dialog, check "Always allow from this computer" and click OK
Download pwn.zip here: http://forum.xda-developers.com/showpost.php?p=53407127
Unzip "pwn" from the zip file to your windows current directory
adb push pwn /data/local/tmp/pwn
adb shell chmod 755 /data/local/tmp/pwn
adb shell /data/local/tmp/pwn
Hear USB disconnect sound
Wait about 1 minute (may or may not need to disconnect and reconnect USB cable)
su (should give a root shell)
Install SuperSU from Play Store
The SU binary needs to be updated. Continue?
Continue > Normal > OK