Do you have a model number please.
Also does it look like its broken?
IQ300 is just a range of appliance which Siemens do.
I need to E-nr number of the rating plate inside the freezer usually be either the bottom baskets or the top baskets. It starts E-nr
Thanks for that.
What you need to do is remove 1 of the brackets that the flap fits onto.
If you look at one of the brackets towards the front of the bracket is a tab. Get a small flat bladed screwdriver behind it and you should be able to remove it from there.
Then you can fit that bracket onto the flap and then insert the flap onto the other bracket thats still attached to the freezer.
Then you can slot the other bracket back into place and that should do it.
Try that and see how it goes. But you need to remove just 1 bracket to get that door on.