Brake drum backplates

[LukeZS96]

Hi guys, having abit of trouble removing the rear backplate off the trailing arm. Have the hub, brake shoes, brake lines etc. off and the 4 bolts holding the backplate to the arm but it still won't budge. Any ideas without damaging it?

[talkingcars]

Sorry, I have no idea but I guess it's a while since it was off so it might need some persuasion .