mobile

hi guys, i have a nexus 10 and before i upgraded toATO lollipop i was able to reset and restore to factory through the OS and also through recovery by pressing POWER + VOLUME- so now i installed the OTA lollipop update, that updated my nexus 10 to 5.0.2 if im not mistaken and now that key combination doesnt work. so now my question is how do i enter or go into the stock recovery menu of my lollipop nexus 10. the tablet is completely stock and never has been rooted.

thanks in advanced
peace out