I have bought a z4 2012 of a lady who hit a carb and broke the control arm and wheel etc , now the main fuse has blown in the boot which this does happen , so since its been stud in a yard , the battery has gone flat , so we have tryed a jump box under the engine bay , but its totaly dead , key wont work now as it stuck in the ingnition ,and carnt get in the boot to even charge the battery , has anyone had this problem