Dell ME 4024 SAN firmware uprade issue.

Hi Team,

I am using a Dell EMC PowerVault ME4024 SAN.

Previously, the SAN was running with dual controllers without any issue. However, Controller A failed, and since then the system has been operating only on Controller B.

We have now replaced the faulty Controller A with firmware GT280R014-01 with another controller, but unfortunately the controller is not coming online or showing operational status.

Could anyone please assist or suggest the required steps to bring Controller A back into operation?

Current observations:

• Controller B is working fine with firmware  GT280R006-02

• Storage and volumes are accessible through Controller B

• Replaced Controller A is inserted properly, but not becoming operational

Any guidance would be appreciated.

Thank you.

Here is the log detail

# show controllers
Controllers
-----------
Controller ID: A
Serial Number: CN0D3M1VFCG000171BHHA00
Hardware Version:
CPLD Version:
MAC Address: 00:00:00:00:00:00
WWNN: 208000C0FFF1270A
IP Address:
IP Subnet Mask:
IP Gateway:
IP6 Link Local: /0
IP6 Link Local GW: ::
Disks: 24
Virtual Pools: 2
Disk Groups: 2
System Cache Memory (MB): 8192
Host Ports: 4
Disk Channels: 2
Disk Bus Type: SAS
Status: Down
Failed Over to This Controller: No
Fail Over Reason: Not applicable
Multi-core: Disabled
Health: Fault
Health Reason: The controller is not operational.
Health Recommendation: - Restart the Storage Controller in this controller module, unless it is performing an operation where it is normal for it to be shut down, such as firmware update.
Position: Top
Phy Isolation: Enabled
Controller Redundancy Mode: Failed Over
Controller Redundancy Status: Operational but not redundant

Controllers
-----------
Controller ID: B
Serial Number: CN0D3M1VFCG009BP1689A00
Hardware Version: 8.1
CPLD Version: 3.9
MAC Address: 00:C0:FF:51:04:5C
WWNN: 208000C0FFF1270A
IP Address: 172.24.24.165
IP Subnet Mask: 255.255.255.0
IP Gateway: 172.24.24.1
IP6 Link Local: fe80::2c0:ffff:fe51:45c/128
IP6 Link Local GW: ::
Disks: 24
Virtual Pools: 2
Disk Groups: 2
System Cache Memory (MB): 8192
Host Ports: 4
Disk Channels: 2
Disk Bus Type: SAS
Status: Operational
Failed Over to This Controller: Yes
Fail Over Reason: Restarting
Multi-core: Enabled
Health: OK
Health Reason:
Health Recommendation:
Position: Bottom
Phy Isolation: Enabled               Controller Redundancy Mode: Failed Over
Controller Redundancy Status: Operational but not redundant

Success: Command completed successfully. (2026-05-05 13:46:30)

======================================================================================================================================================
2026-05-05 11:52:24 [310]  #B174617: # show system

System Information
------------------
System Name: ME4024
System Contact: NOC Team
System Location: IMDC-DataCenter
System Information: DELLEMC-Storage
Midplane Serial Number: 00C0FFF1270A
Vendor Name: DELL EMC
Product ID: ME4024
Product Brand:
Enclosure Count: 1
Health: Degraded
Health Reason: A subcomponent of this component is unhealthy.
Other MC Status: Not Communicating
PFU Status: Idle

  Unhealthy Component
  -------------------
  Component ID: Enclosure 0, Controller A
  Health: Fault
  Health Reason: The controller is not operational.
  Health Recommendation: - Restart the Storage Controller in this controller mod                                                                                                 ule, unless it is performing an operation where it is normal for it to be shut d                                                                                                 own, such as firmware update.