Can't manually rotate bones in inspector or through script.

Hi,

I have a humanoid rig and i want to pose the fingers onto an object through script, but i cannot. I can't change the orientation/rotation of finger bones in inspector too, until and unless i turn off the animator component.

The layers have an avatar mask and i have disabled the hands on the avatar mask. Still, the finger bones don't rotate.

I tried doing it through scripting aswell, in lateupdate. However, it still doesn't work.