4550T Firmware Recovery

Occasionally, firmware can corrupt, preventing the switch from booting.

To recover a dead or re-booting switch, try the following:

Two firmware files are required:

• The "Diagnostic" image: 4500_53003_diag.bin
• The "Agent code" image: 4000_573031s.img

Connect a Serial cable to the front panel Console port, set a PuTTY (or Serial for OSX) to: 9600-8N1

The "Diagnostic" image

• Power up, and press <Shift> 3 from the console (9600)
  You will see: Please press CTRL-C go to download MENU.
• Press Ctrl-C to display the "BOOT CONFIGURATION MENU":

• Tab (or arrow) through the options, use space to change values
• Change the Baud Rate to 115200 (space), highlight APPLY and press <enter>
• Change the Console Baud Rate to 115200, and send the .bin file with Z-Modem (eg: File ► Send File...)

When complete, the switch will reboot.

The "Agent code" image

Having loaded the Diagnostic image, we now have to load the Agent Code. This step requires a TFTP server (eg: SolarWinds or PumpKIN) hosting the .img file (beyond the scope of this article). Connect the TFTP server to a switch port, eg: port 1.

• Change the baud rate back to 9600, power up the ERS, and watch the output...
  You will see: Press Control-C to Enter Diag
• Press Ctrl-C, the following menu will display:

>> Break Recognized - Wait...

  Press 'a'   to run Agent code
  Press 'd'   to download Agent code                         ⇐ press 'd'
  Press 'e'   to display errors
  Press 'c'   to clear log message
  Press 'i'   to initialize config flash
  Press 'p'   to run POST tests...

• Press d to download Agent code, the .img file.
  The switch will prompt for the following information:

Enter Port Number                [ <auto> ]:1                ⇐ switch port with TFTP server
Enter Speed: 10, 100, 1000       [ <auto> ]:
Enter Local IP Address    [192.168.192.168]:10.10.10.10      ⇐ switch IP address
Enter Server IP Address   [        0.0.0.0]:10.10.10.11      ⇐ TFTP server IP address
Enter Subnet Mask         [  255.255.255.0]:
Enter Default Gateway     [           None]:
Enter Filename                             :4000_573031s.img ⇐ image filename .img

If the TFTP server responds, you will see a download progress bar while the file is retrieved.
When complete, the file is automatically flashed and decompressed.

  Sys IP address :  10.10.10.10
  Subnet Mask    :  255.255.255.0
  Default Gateway:  None
  
  TFTP Server IP :  10.10.10.11
  TFTP Port Num  :  1
  Runtime File   :  4000_573031s.img
  Download AGENT image ....................    9953984 bytes (OK)          
  Delete Old Image ........................................ 100 %
  Program AGENT Image ..................................... 100 %
 
Starting Agent Code...

Decompressing the image   [\]

The switch will reboot to the Avaya splash screen. Press Ctrl-Y to start.
FW (diagnostic) and SW (agent code) indicate the installed software versions.

You can also Ctrl-Y, en, show sys-info for a more detailed display.

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