If you need to perform immediate recovery of corrupted BKF file, then I suggest you to use Advanced BKF Recovery Software for resolving any type of corruption issues. The tool provides wide range of features which you do not get from any other software like: multiple BKF file at a time, recover corrupted BKF file which are splitted into multiple parts and recover data from compressed BKF file.

You can read more about this software, here:- Repair BKF file using BKF Recovery Tool