I tried to root my phone and it worked only with Kingo Root and after I reboot my phone, I do not have root-access. I have tried several times, please answer me. I really need to root my phone. It's Vonino Jax QS.
If Kingo root can't help you root successfully. You can try another tool like iRoot.I once used and found it do no harm to my device.Try as this guide: one click root to root Android phones and tablets