I bought innjoo f2 for some time now but not been able to root it for lack of time to really explore the tab, just yesterday I was able to root it and the apps I want to run on it before that refused to run is now running flawlessly..... All thanks goes to kingroot.
All you need to root the tab is the version 4.1(http://www90.zippyshare.com/v/KLbmjMPM/file.html),
Internet access and not through any tweaking apps like psiphon or tweakware just direct access or WiFi from other device.

REQUIREMENTS
– Kingroot App (preferably version 4.1)
– Internet connection

STEP 1: Install and Launch the kingroot apk app, it will detect the phone model (FIRE)

Innjoo f2

STEP 2: click on the circle shaped button then wait for some minutes. You will also see progress report on the screen in the form of percent (%). Once it get to 100%. You are done rooting the Innjoo fire.

Rooting Innjoo f2

STEP 3: After the rooting the Innjoo fire, you will see the number of Apps draining your device and a blue link named PURIFY.
Root Innjoo f2

Innjoo f2 rooting

Click it to exit all the Apps draining your battery and also consuming RAM.

That’s all!
NOTE: Your Internet connection must be SWITCHED ON while undergoing this steps.

When kingroot is running after get internet access the tab will not let it install the additional apps just click on more details and click on allow anyway