Applicable Models

• TVS-h874T/TVS-h674T/TVS-h874/TVS-h674/TVS-h474/TVS-h874X
• TBS-h574TX
• TS-h3077AFU/TS-h1677AXU-RP/TS-h1277AXU-RP/TS-h2477AXU-RP
• TS-h1277AFX
• TS-h3087XU-RP/TS-h2287XU-RP/TS-h1887XU-RP/TS-h987XU-RP
• TVS-h1688X/TVS-h1288X
• TDS-h2489FU/TDS-h2489FU R2
• TS-h2490FU/TS-h1090FU
• TS-h1290FX
• TVS-675
• TS-h1886XU-RP R2
• TS-h886
• TS-h973AX/TS-473A/TS-673A/TS-873A
• TS-1273AU-RP/TS-1673AU-RP/TS-873AeU/TS-873AeU-RP

Important Notes

• iSCSI & Fibre Channel does not support downgrading from QuTS hero h5.3.x or later to QuTS hero h5.2.x or earlier. If you downgrade the firmware, you will have to manually reconfigure all iSCSI targets and LUNs.
• When the NAS is in a high-availability cluster, certain applications, utilities, and mobile features are temporarily unavailable in QuTS hero h5.3.x. For details, see the following links: https://www.qnap.com/go/how-to/faq/con_show.php?cid=3187 https://www.qnap.com/go/how-to/faq/con_show.php?cid=3188
• Certain applications, utilities, and mobile features are temporarily unavailable in QuTS hero h5.3.x. For details, see: https://www.qnap.com/go/how-to/faq/con_show.php?cid=3183

Security Updates

• Applied multiple security updates to further enhance system security.

Fixed Issues

• Fixed an issue where QuTS hero would not restore a shared folder whose description contained certain special characters when restoring system settings.
• Fixed an issue where users could not expand a thick shared folder after converting a thin shared folder to a thick shared folder.
• Fixed an issue where SMB access to NAS shared folders would be slightly delayed when one of domain controllers was shut down in a dual-controller environment.
• Fixed several issues to improve system stability during high availability synchronization.
• Fixed an issue where the system would not delete temporary files after backing up system files.
• Fixed an issue where the system would display a message about network speed mismatch when users enabled SMB multichannel for a virtual switch.
• Fixed an issue where mcelog would keep sending error messages if it did not support the processor on the NAS model.
• Fixed an issue in the deduplication process to improve system stability.
• Fixed an issue where the data type of OID (Object Identifier) returned by SNMP Agent was not consistent with the definition of MIB (Management Information Base).
• Fixed an issue where new users could still log in via SMB without changing their password even though "Change password on first login" was enabled.
• Fixed an issue where domain users could not view some shared folders via FTP after administrators added a domain user group.
• Fixed an issue where a guest user would connect to the tmp folder when trying to connect to the NAS home folder.
• Fixed an issue where LDAP domain users could log in to the NAS via SMB but not via HTTP/HTTPS.
• Fixed a rare out-of-memory (OOM) issue that would cause an abnormal state and service disruption on a high-availability active node.
• Fixed an issue where users occasionally could still keep attempting SMB login even if they had already reached the threshold of allowed failed SMB login attempts.
• Fixed an issue where Domain Security Wizard would stop responding when attempting to add a large number of unreachable domain controllers.