I got my 1 & 9 restrictions removed by doing an electrical handskills course covering both practical and theory elements. The problem is that this does not remove the restrictions from your type approvals on your licence. Only if you do a "technology update course" for that type will you get these removed. Of course, on your next type approval, if it is a full B1 course, that will be an unrestricted type approval if you have no 1 & 9 restriction on your licence.