THX to http://lenovo-forums.ru
root with kingoo-root, then install SuperSU from playstore, install binary then you can uninstall kingooroot
then you also can update with system update lenovo (settings=>info telefone=>systemupdate)
if you register @lenovo-forums.ru you also can download cwm-based recovery and install via mobile uncles tools,
best working sdfix apk => kitkat externalSD card patch => from playstore
enjoy…!!!
updatezip new => A7600H_A442_000_029_150324_ROW 3G + WiFi, latest from OTA,