Drupal boost cache clear (solved)

In drupal 7, the boost module no longer has the "clear all cache" button.
Follow this instruction to clear it.
1 set minimum cache life time to 0.
2 take off the tick where it says" Ignore a cache flush command if cron issued the request".
3 Run drush cc all or flash all cache at the gui
4 run $ drush cron run or run cron at the gui
5. Repeat the process till boost cache is cleared.
Restart Apache if necessary
$ service httpd restart

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