A federal judge Wednesday blasted a Chicago law firm’s bid for a do-over.In a written opinion, U.S. Magistrate Judge Jeffrey Cole declined to back off from his previous criticism of the conduct of Bock, Hatch, Lewis & Oppenheim LLC in representing a now-former client that alleges it received an unwelcome “junk” fax.Cole leveled his criticism against the Bock firm and other counsels for Physicians Healthsource Inc. in an opinion issued in June.In that June opinion, Cole denied Physicians Heathsource …