Well since you do have ADB connectivity why can't you hook a bruting utility and push root ? Romaster_188.8.131.5293_Setup use as describe back in the roll back thread and the rooting thread 4 the new yes I kno wat is in chinese but this is the 1 that you must use sent you cannot install the apk install software plugin your tablet look at the upper right corner you will see an gear icon tap that then second row down second icon over "root"
The chinese software worked! Thank you very much! As I first rooted with towelroot I wasn't aware that it was possible to root without booting into android! I think I won't edit the build.prop again lol.