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# 21 Upgrade notes for 6.4.11

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#### Package size handling for system.sw.packages.get item

When monitoring the [`system.sw.packages.get`](/manual/config/items/itemtypes/zabbix_agent#system.sw.packages.getregexpmanager) item using Zabbix agent 2, if the returned package data lacks information about the package [size](/manual/appendix/items/return_values#system.sw.packages.get), the size value is now automatically set to 0.

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#### Consistency introduced in sha256 checksums of vfs.file.cksum item

In earlier Zabbix versions, the Zabbix agent item [`vfs.file.cksum`](/manual/config/items/itemtypes/zabbix_agent#vfs.file.cksumfilemode) produced different sha256 sums for the same file depending on the platform (processor architecture) – sha256 sums on AIX, HP-UX (Itanium) and Solaris (SPARC) differed from those produced on Intel x86-64 platforms.

The issue has now been fixed; however, after upgrading, monitoring sha256 sums of files on AIX, HP-UX, or Solaris SPARC may result in false positives of files having been modified.

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