Important Notes

• Added support for new NAS models in the following series: x73A (TS-473A, TS-673A, TS-873A, TS-h973AX), x73AU (TS-873AeU, TS-873AeU-RP, TS-1273AU-RP, TS-1673AU-RP), x74 (TVS-h874X), and x77AXU (TS-h2477AXU-RP).
• 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
• 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
• 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.

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

Security Updates

• Applied multiple security updates to further enhance system security.

Enhancement

Domain Security

• Simplified the setup process for Azure Single Sign-on (SSO) and updated the feature name to "Microsoft Entra ID Single Sign-on (SSO)".

High Availability Manager

• Improved initial synchronization speed during HA cluster creation.

Fixed Issues

• Resolved a rare issue where under certain conditions, the "Auto unlock on startup" setting for encrypted shared folders was incorrectly changed to "Unlock with encryption key on NAS" after folder creation, even though it was initially set to "Unlock with encryption key on KMIP server".
• Fixed an issue where the "Remote" snapshot list view for a source shared folder would get stuck on loading after its destination snapshot vault was deleted.
• The Create Storage Pool wizard now automatically selects a suitable RAID type based on the number of available disks of the selected disk type. You can still select another RAID type if needed.
• Fixed an issue where, after an HA failover, data transfers to an NFSv3-mounted shared folder could become inconsistent.
• Enhanced HDD standby mode reliability.
• Improved system stability when creating an HA cluster where the active node contains a large number of existing snapshots.