I have a few 190’s and I can usually get the blower cover off without touching firewall cover.
There are two more of those same type of clips that you see at the top way down low along the sides. They must be popped out as well. It can be a real bear because they are so low.
I usually use some type of home made tool with a 90 degree bend to reach down along the side and pop out. You then just pivot the top forward towards the engine.