yes i use a core to control a keyboard with the program of julienvoirin with id 0 that's connect to sid v2 ...that's the problem ! i want to use my midi rear plug to upload but id 0,1,2,3 is used and the new core with id 4 will be better if i don't want to open the box each time. in the file "change_id_v1_9d.zip " there's no id 4 . it's maybe very easy but i can't find the clue. thank you