Just when it appeared that Bank of America (BAC) might be turning the corner, it dropped another bombshell Wednesday, racking up $6 billion in expenses for mortgage litigation that resulted in an unexpected quarterly loss — its first since 2011.

B of A has spent the past four years resolving massive mortgage-repurchase claims and settling regulatory disputes tied to crisis-era woes. But the bank now appears to be waging an even larger battle to convince analysts and investors that there is some end in sight to its litigation risk.

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