Did you notice that @Marine did a review in English /How to/ install /e/ R on a samsung galaxy s10e already running android 12 which I commented on post 2 apropos Prenormal.
I remember it was observed that Prenormal was an issue not shown of this device’s Download mode screen (?? poor memory) but you might consider what he reports he had to do to overcome this “unknown” first. He had to persevere for a long time although perfectly familiar with the routine on earlier Samsung.
Part of the original thread is in English or French and English in the area (re Prenormal) of Downgrading android 12 to 11 on a samsung galaxy s10e and installing /e/ - #78 by aibd.