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1. How to Recover Firmware Cisco Catalyst 3750X
Restore a corrupt Cisco 3750 IOS or Internetwork Operating System image by
transferring a new image to flash storage using the Xmodem protocol. Power anomalies
such as brown outs and surges can cause irreparable IOS image corruption. You should
delete and replace a corrupt IOS image to ensure that the Cisco 3750 remains reliable.
Access “switch:” mode through a serial connection and recover Cisco 3750 firmware to a
working state.
Instructions
1 Connect the Cisco serial console cable 9 pin connector to the Windows 7 computer
serial COM port. Plug the other end of the serial cable into the Cisco 3750 “Console”
port.
2 Launch the Tera Term terminal console program and click “File” then “New connection.”
Click the “Serial” radio button. Click the “Port” box and then the name of the serial COM
port connected to the Cisco 3750 switch. Click the “OK” button.
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3 Unplug the Cisco 3750 switch power cable. Press and hold down the “Mode” button
located on the Cisco 3750 front left panel. Power up the Cisco 3750 switch and release
the “Mode” button when the Port 1x light turns off.
4 Click the Tera Term window and press the “Enter” key two times. Type “flash_init” at the
command prompt and tap “Enter.” Write “load_helper” at the command prompt and press
“Enter.”
5 Type “dir flash:” on the command line and press “Enter.” View the command line output
and note any files that end with “.bin” or directories that have “3750” in the name.
6 Type “dir flash:directory-name” at the command line. Replace “directory-name” with the
name of a directory that has “3750” in the name and press “Enter.” Inspect the command
line output and note any files that end with “.bin.”
7 Type “delete flash:image-file-name” at the command prompt. Replace “image-file-
name” with the name of the “.bin” file noted earlier. Press the “Enter” key. Tap the “Y” key
when prompted to confirm deletion and press “Enter.”
8 Click the “File” menu in the “Tera Term VT” window and then “Transfer.” Click
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2. “Xmodem” and then “Send.” Browse to and click on the new Cisco 3750 IOS image file
and press “Enter.” Wait for the file transfer to complete (approximately 20 minutes).
9 Type “boot flash” at the command prompt and press “Enter” to boot the Cisco Switches
Price with the new image.
—Original resource from
http://www.ehow.com/how_12131145_recover-firmware-cisco-3750.html
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