Repairing my FFC connector - what to use?
Before getting a replacement, you can try cutting the cable with scissors to so that all pins go to the edge:



(picture borrowed from here)

Putting the cable between two sheets of paper (and cutting the whole sandwich together) helps to restrain the cable as you cut it, limiting the damage from deformation. clear plastic sheets work too, with the advantage that you get to see the cable as you cut it.

Worst case, you further damage your already damaged cable.