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Well you are not the only one, i lost my rank too and can't do nothing about it. Recently there are a lot people who lost their stats. Alternately you could try to delete GameSettings.bin located in your documents/BFBC2 folder and play 1 match on servers with SA weapons available, but i really don't think this method will help you since none of the players who lost their stats in these 2 days didn't reported that their stats are back.