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msanjaypadma
Staff
msanjaypadma
Staff
April 26, 2026

Troubleshooting Tip: FortiGate 6000 Series FPC dead state issue due to BIOS mismatch

  • April 26, 2026
  • 0 replies
  • 91 views

Description

This article describes how to troubleshoot FortiGate 6000 Series FPC Dead State Issue Due to BIOS Mismatch.

Scope

FortiGate 6000 Series Chassis.

Solution

Where FPCs are displaying a DEAD status with the error message: 'BIOS mismatch, please reset FPC7.' To address this, a flash formatting process of the affected FPCs has been implemented successfully.

Issue logs: 

FortiGate-6000F (global) # diagnose load-balance status 
========================================================================
MBD SN: F6KF01T0xxxx
Primary FPC Blade: slot-1

Slot 1: FPC6KFT0xxxx
Status:Working Function:Active
Link: Base: Up Fabric: Up
Heartbeat: Management: Good Data: Good
Status Message:"Running"
Slot 2: FPC6KFT0xxxx
Status:Working Function:Active
Link: Base: Up Fabric: Up
Heartbeat: Management: Good Data: Good
Status Message:"Running"
Slot 3: FPC6KFT0xxxx
Status:Working Function:Active
Link: Base: Up Fabric: Up
Heartbeat: Management: Good Data: Good
Status Message:"Running"
Slot 4:
Status:Dead Function:Active
Link: Base: Up Fabric: Down
Heartbeat: Management: Failed Data: Failed
Status Message:"BIOS mismatch, please reset FPC4." <---------
Slot 5:
Status:Dead Function:Active
Link: Base: Up Fabric: Down
Heartbeat: Management: Failed Data: Failed
Status Message:"BIOS mismatch, please reset FPC5." <---------

  • Below is a detailed overview of the procedure followed:

  1. Step-by-Step Process for Flash Formatting and Image Deployment:
    Upload the Firmware Image to the Firewall via TFTP.

  1. 1. Network Configuration:
    Connect an Ethernet patch cable to the MGMT1 port on the firewall.

  • Assign the IP address 192.168.1.154 to the MGMT1 interface.

  • The firewall’s MGMT1 interface IP was configured as 192.168.1.99.

  1. 2. Image Upload Command :

Syntax: 


FortiGate-6000F (global) # execute upload image tftp <image-file> <comment> <tftp-server-address>

Example:

FortiGate-6000F (global) # execute upload image tftp FGT_6000F-v7.6.6.M-build3652-FORTINET.out comment 192.168.1.154

(Ensure the FortiGate can communicate with the external TFTP server at this address)

  1. 2. Verify Internal TFTP Server IP:

FortiGate-6000F (global) # fnsysctl ifconfig base-tftp

  1. Reboot and Flash Format the Affected FPC.

  1. 1. Reboot Command.
    Note: If not able to execute commands after establishing a console connection to the FPC, attempt to reboot the respective FPC via the MBD.

FortiGate-6000F (global) # execute load-balance slot reboot <slot-number>

(Replace <slot-number> with the specific FPC slot number).

  1. 2. Connect to the Console:

After the reboot, connect to the respective FPC by running below command:

 
FortiGate-6000F (global) # execute system console-server connect <slot-number>

  1. 3. Monitor Boot and Enter Formatting Menu:

  • During the reboot, observe the console output.

  • When prompted, press any key to interrupt the boot process.

Example : 

Enter P,D,I,S,G,V,T,F,E,R,N,Q or H:
[C]: Configure TFTP parameters.
[R]: Review TFTP parameters.
[T]: Initiate TFTP firmware transfer.
[F]: Format boot device.
[B]: Boot with backup firmware and set as default.
[I]: System configuration and information.
[Q]: Quit menu and continue to boot.
[H]: Display this list of options.

  1. 4. Format Boot Device:

  • Select option F to format the boot device.

  • Confirm the action when prompted.

  • Wait for the formatting process to complete.

Example:

 
Enter C,R,T,F,B,I,Q,or H:
All data will be erased, continue:[Y/N]?
Formatting boot device...
..............................
Format boot device completed.

  1. Install Firmware Image on the FPC.

  1. 1. Configure TFTP Parameters:

  • After formatting, press C to configure the image download port and network settings.

  • Set parameters such as:

  • Image download port: MGMT1.

  • Local IP address: e.g., 169.254.255.2.

  • Subnet mask, gateway, and TFTP server IP (validate with #fnsysctl ifconfig base-tftp).

  • Firmware image filename: image.out.

Example: 


Enter C,R,T,F,B,I,Q,or H:
[P]: Set image download port.
[D]: Set DHCP mode.
[I]: Set local IP address.
[S]: Set local subnet mask.
[G]: Set local gateway.
[V]: Set local VLAN ID.
[T]: Set remote TFTP server IP address.
[F]: Set firmware image file name.
[E]: Reset TFTP parameters to factory defaults.
[R]: Review TFTP parameters.
[N]: Diagnose networking (ping).
[Q]: Quit this menu.
[H]: Display this list of options.
Image download port: MGMT1
DHCP status: disabled
Local VLAN ID: none
Local IP address: 169.254.255.2
Local subnet mask: 255.255.255.0
Local gateway: 169.254.255.1
TFTP server IP address: 169.254.255.1
Firmware file name: image.out

  1. 2. Initiate Firmware Transfer:

  • Exit the configuration menu by pressing Q.

  • Start the transfer by pressing T.

  • Monitor the transfer progress and verify integrity.

Enter C,R,T,F,B,I,Q,or H:
Please connect TFTP server to Ethernet port "MGMT1".
MAC: E8:CC:D6:AA:BB:AA
#############################################################################################################################
Total 131464435 bytes data downloaded.
Verifying the integrity of the firmware image.
This firmware image is certified.
Total 262144kB unzipped.

  1. 3. Set Firmware as Default:

  • After successful upload, press D to set the new image as the default.

  • The system will verify files and start the firewall.

Save as Default firmware/Backup firmware/Run image without saving:[D/B/R]?D
Programming the boot device now.
.............................................................................................................................................................
Verifying the integrity of system files.
Reading boot image 3432477 bytes.
Initializing firewall...
System is starting..

  • Once the FPC successfully boots, exit the console connection with Ctrl + X.

  1. Validate FPC Status.

  • Check Connection Status:

FortiGate-6000F (global) # diagnose load-balance status
==========================================================================
MBD SN: F6KF01T0xxxx
Primary FPC Blade: slot-1
Slot 1: FPC6KFT0xxxx
Status:Working Function:Active
Link: Base: Up Fabric: Up
Heartbeat: Management: Good Data: Good
Status Message:"Running"
Slot 2: FPC6KFT0xxxx
Status:Working Function:Active
Link: Base: Up Fabric: Up
Heartbeat: Management: Good Data: Good
Status Message:"Running"
Slot 3: FPC6KFT0xxxx
Status:Working Function:Active
Link: Base: Up Fabric: Up
Heartbeat: Management: Good Data: Good
Status Message:"Running"
Slot 4: FPC6KFT0xxxx
Status:Working Function:Active
Link: Base: Up Fabric: Up
Heartbeat: Management: Good Data: Good
Status Message:"Running"
Slot 5: FPC6KFT0xxxx
Status:Working Function:Active
Link: Base: Up Fabric: Up
Heartbeat: Management: Good Data: Good
Status Message:"Running"

  • Confirm all FPCs show as 'Working' with 'Running' status messages.

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