Too many ones,no point in even trying in temp.

Thank you, not sure it's logical, but spoiler is treat it like a windmill.

Thank you thenight , I tried several different solutions before I saw your spoiler.

HINT: Diagonal lines from R1/c1, R1/c3, R3/c1 - and symmetry on the other side.

Thank you for the hint Joe Tramp.

There are multiple possible solutions.