The process is further complicated by the fact that "SPD Flash Tool" refers to several different utilities. It's crucial to understand the differences because one might solve an error that another cannot:

No, they are different. A checksum error (e.g., S_CHKSUM_ERROR ) indicates that the file being flashed failed a data integrity check, meaning it might be corrupted or modified. The BKF_NV error is a process-specific failure during the backup or restoration of the NV partition.