Trouble to boot into OSX after install windows 10 on MacBook pro Before this problem win + OSX  worked fine. But I tried to settings>recovery>Advance Startup from windows. after a restart , there is no two boot option . only windows boot option is appear. But how can I go to my previous duel boot option?
now I'm in windows 10.
Press thealt or option buttons while pressing the power button to select Mac OSX or Windows