unrar t azgb20.rar This tests every file without extracting. Note the exact byte offset of the first error.
unrar x -kb azgb20.rar The -kb flag (keep broken) forces extraction of all readable files, discarding only the specific corrupt blocks. azgb20rar fix
Disclaimer: This guide is for legitimate data recovery only. Do not attempt to bypass passwords for archives you do not own. unrar t azgb20