Boldenone through aromatase gets converted to E2. That is the case. E1 gets converted to E2 in the body. (Seemingly a too small amount)
Look at the upper row of hormones. To get Converted to E1 boldenone would first need to be oxidized by 17b-HSD in the body. It could equally be taken up by aromatase and then get converted so it’s highly unlikely that boldenone always first goes through one enzyme then the other.
I believe because of the evidence I know boldenone gets converted to E2.