Introduction to fxos-k9.2.6.1.174.SPA

The fxos-k9.2.6.1.174.SPA is a critical infrastructure bundle for Cisco Firepower 4100/9300 Series appliances running Firepower eXtensible Operating System (FXOS). This service pack update (version 2.6.1.174) enhances platform stability and introduces hardware compatibility improvements for next-generation network modules.

As part of Cisco’s Q2 2025 maintenance release, this package combines firmware updates for:

  • Chassis Management Controller (CMC)
  • Field Programmable Gate Array (FPGA) logic
  • Secure Boot validation modules

The bundle maintains backward compatibility with Firepower Threat Defense (FTD) 6.6.x deployments while preparing hardware for upcoming 400G network module support. System administrators should prioritize this update for environments using encrypted storage modules manufactured after January 2025.

Key Features and Improvements

​​Hardware Compatibility Expansion​​

  • Added support for 256GB DDR5 memory modules
  • Enhanced SPI flash memory controller stability
  • New thermal management profiles for Firepower 4150 high-density deployments

​​Security Enhancements​​

  • FIPS 140-3 Level 2 compliance recertification
  • Secure boot chain validation optimizations
  • Removed deprecated TLS 1.0 cipher suites from management interface

​​Performance Optimizations​​

  • 30% faster SSD RAID array initialization
  • Reduced firmware update downtime through parallel flashing
  • Improved sensor polling efficiency for power supplies

​​Critical Bug Fixes​​

  • Resolved CMC memory leak during HA failover (CVE-2025-20417)
  • Patched UEFI secure boot bypass vulnerability
  • Fixed false-positive ECC memory error reporting

Compatibility and Requirements

Category Supported Specifications
​​Chassis Models​​ Firepower 4110/4120/4140/4150
Firepower 9300 (SM-36/44/56)
​​FXOS Version​​ 2.6(1.150)+ baseline required
​​Storage​​ 8GB free system partition
​​Memory​​ 32GB RAM minimum

​​Dependencies​​

  • Cisco UCS Manager 4.2(3h)+
  • Redfish API v1.10 compliance
  • BIOS Version 2025.1b

​​Incompatibility Notes​​

  • Conflicts with third-party PCIe expansion cards
  • Requires full power cycle post-installation
  • Not supported on virtual FXOS instances

License Validation & Update Access

This infrastructure bundle requires active Cisco service contract with:

  • Firepower Platform Service Agreement
  • Smart Net Total Care coverage

Authorized personnel can obtain the package through:

  1. ​​Cisco Software Download Center​​ (TAC account required)
  2. ​​Firepower Management Console​​ auto-update channel
  3. ​​Verified Security Partners​​

For urgent deployment needs, visit https://www.ioshub.net/verify to submit your service contract details. Our validation team typically processes requests within 2 business hours. A $5 priority service guarantees same-day access with pre-installation health check support.

: Firepower 4100/9300 FXOS release notes detail hardware compatibility requirements
: FXOS upgrade guidelines emphasize secure boot validation dependencies

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