How to reset bone axis in edit mode to global from local

Hi guys. I have a question. How to reset bone axis in edit mode to global from local? To understand better what i mean, just take a look on the picture. White axis, are the local axis of bone and the rgb pointers are the global axis. So how do i reset axis for the bone? In object mode, the combination is ctrl+a, but what for the bones?

Anyone? Do u have an idea?

The bones Y axis is always along the length of the bone, to change the x/z rotation, you can do CTL-N to recalculate the normal, if that doesn’t work you can manually by going to the bone tab and changing the “roll”