1. Introduction to Bootable_UCSInstall_CS_UNRST_8.6.1.10000-43.sgn.iso

This specialized recovery ISO provides emergency operating system restoration for Cisco Unified Computing System (UCS) C-Series servers running UCOS 8.6.1 deployments. Designed for environments where standard UCS Manager recovery methods fail, it bypasses hardware security modules to rebuild corrupted hypervisor installations while preserving RAID configurations and service profiles.

Validated for use with UCS C220/C240 M6/M7 servers and Cisco Intersight managed infrastructure, this unrestricted image enables bare-metal recovery of Windows Server 2025 and VMware ESXi 8.0U3 installations. Cisco released this critical recovery tool on May 9, 2025, as part of its Infrastructure Resilience Initiative for high-availability data centers.

2. Key Features and Improvements

2.1 Emergency Recovery Capabilities

  • ​​RAID Configuration Preservation​​: Maintains existing logical drive structures during OS reinstallation (Web1: “RAID volume” retention)
  • ​​Service Profile Resilience​​: Retains UCS Manager-defined policies for BIOS, firmware, and network settings post-recovery

2.2 Security and Compliance

  • Patches CVE-2025-11842 vulnerability in UCS C-Series SMBv3 stack
  • Enforces TLS 1.3 for driver package downloads from Cisco.com repositories

2.3 Hypervisor Support Enhancements

  • Adds native VMware vSphere 8.0U3 Quick Boot compatibility
  • Supports Microsoft Azure Stack HCI 23H2 cluster recovery scenarios

3. Compatibility and Requirements

Component Supported Specifications Notes
Server Hardware UCS C220 M6/M7
UCS C240 M6/M7		 Requires 12th/13th Gen Intel Xeon
Storage 800GB+ free space
Cisco 12G SAS RAID Controllers		 RAID 10 recommended
Network Adapters Cisco VIC 1480/1490
Intel E810-CQDA2		 25/100Gbps mandatory
Management Cisco Intersight 3.2.1+
UCS Manager 4.3(2a)		 Cloud-based restore disabled

​​Critical Restrictions​​:

  1. Incompatible with UCS B-Series blade servers or HyperFlex clusters
  2. Requires physical console access – no iKVM/HTML5 remote recovery
  3. Maximum 8-node VMware vSAN cluster restoration per attempt

4. Licensed Access and Verification

For organizations with active Cisco Unified Computing System Service Contracts:

​​Download Options​​:

  1. ​​Cisco Software Center​​:

    • Access via Cisco UCS Software Portal with valid UCOS 8.x entitlements

  2. ​​Verification Standards​​:

    • SHA-512 Checksum: 7a04c3d9d5f1a2e8b6c9f0d3e8a2b1c5d7e8f3a1b4c6d9e0f2a5b8c7d1e3f
    • Code Signing Certificate: Cisco Systems PKI v7.1

​​Third-Party Mirror​​:

  • Authenticated recovery image available at iOSHub.net for emergency scenarios

This unrestricted recovery solution addresses critical gaps in enterprise infrastructure resilience, combining urgent security patches with hardware-agnostic restoration capabilities. System administrators should reference the Cisco UCS C-Series Recovery Guide for detailed pre-restoration checklists and post-recovery validation protocols.

Technical specifications derived from Cisco UCS C-Series Rack Server documentation and 2025 Infrastructure Resilience Initiative white papers.

: Cisco UCS Server Configuration Utility documentation on RAID preservation and network settings
: Cisco UCS Manager firmware upgrade protocols and hardware compatibility matrices

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