You Must be Using RF-Root Kernel (http://forum.xda-developers.com/showthread.php?t=1158197) For official roms Or any like cm7 firekernel blackhawk etc (http://forum.xda-developers.com/showthread.php?t=167 

Than You Must Download  Click here

Copy The apk into your phone install the apk as normal then check your fash player working with all youtube videos opera mobile etc enjoy