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Whenever an eZ Publish solution is upgraded, all caches must be cleared in a proper way. This should be done from within a system shell:
Navigate into the new eZ Publish directory.Run the script using the following shell command: cd /<ezp5-root>/ezpublish_legacy/; php bin/php/ezcache.php --clear-all --purge. Purging ensures that the caches are physically removed. When the "--purge" parameter is not specified, the caches will be expired but not removed.
Note: Sometimes the script is unable to clear all cache files because of restrictive file/directory permission settings. Make sure that all cache files have been cleared by inspecting the contents of the various cache sub-directories within the "var" directory (typically the "var/cache/" and "var/<name_of_siteaccess>/cache/" directories). If there are any cache files left, you need to remove them manually.
Minor Versions Update Warning
Please have in mind that, after the upgrade to a major version of eZ Publish, you will need to perform regular updates with composer.
Before any minor update with composer, please execute all require steps described in the 5.4.x Update Instructions.