adb root prompt me that it is unable on product builds. But I gave a try this way after Googling. Though adb deamon is not in root mode I have rooted my device with the help of saferoot. (Thanks saferoot)
adb shell su (now with root)
I mount rootfs / in read write mode.
I notice default.prop file and open it using vi. Value of ro.secure=1 and ro.debuggable=0.
I change those value as follow: ro.secure=0 and ro.debuggable=1
exit from shell and execute adb kill-server and adb start-server
But still adb root tells that it is unable on product builds.
Can I get adbd run as root in this way? what has I missed.