Airbus: FBW Accidents and differences between Airbusses

I need some information about the accidents caused by a malfunction of the FBW system on Airbusses (only on a320’s accidents i think?)
Also want some information about the differences between the A320-100/-200 (winglets but what else?) and the A321-100/-200 (no external difference?).
Do you also know where i can find detailed information about the Airbus accidents?
SO it looks like there were a few “bugs” in the fbw which were only “activated” in rare circumstances (remember the lh a320, it landed so soft, the fbw system would not let the thrust reversers activate)

Jens