The VRoot program. When I first tried it, didn't work....the VRoot program updated itself to 1.78 and then worked. You might also try the non-English version since it seems to be at 1.78 for download. I think I may have installed both the English and the non-English versions.
I am glad it worked for you. I am a little nervous about this root method since I don't know how it works, and that if I uninstall the Kinguser Superuser.apk then I lose root so I cannot use a different Superuser app. I don't know if this method puts us at risk for someone getting into our tablets without our knowledge. However, VRoot is the only root method that I have found to work for the i925 with VRAMK1 firmware.