What is best CRC correction tool available, free of charge?

I was told KESS and KTAG automaticaly correct CRCs while flashing but does it really work this way?

I had cracked winols that always suggested CRC fix at load of new file, but now this feature does not work anymore. I tried reinstall.. notging helps.. newer version detected cracked version and done something so it does not work anymore..

Thanks for any info!
Rgds, ChuKESS!

No clone talk allowed... but your tools do on most files chks.
Free tool chks best is checksum corrector... but its free = only old ones!
At the end let tool do the job or running winols original with checksum plug ins.
Sometime such original tools mess up chks by fly!