Posts tagged minicom

cisco sg300 upload new firmware via xmodem
posted on 2016-08-07 09:30

After a reset a sg300 did not want to boot, both slices were corrupt. The result was an endless boot loop, where it'd try downloading the firmware but without success.

Using minicom the upload was easy:

  • Turn off switch.
  • If you use an USB-to-serial adapter with a nullmodem cable, most likely the interface is /dev/ttyUSB0. Look through your devices under /dev, in case it is /dev/ttyUSB1
  • minicom -s and setup everything.
  • baud rate 115200 (instead of the usual 9600 with most cisco devices), 8N1 (8 bits, no parity, 1 stop bit), no hardware or software flow control
  • minicom -D /dev/ttyUSB0
  • start switch, press ESC when prompted
  • ctrl-a, s and choose xmodem
  • navigate to the file, or choose the [Goto] menu at the bottom
  • Space to select the file, Enter.

A window like this should pop up and the upload should begin:

+-----------[xmodem upload - Press CTRL-C to quit]------------+                                                                 
|Sending sx300_fw-14502.ros, 57760 blocks: Give your local XMO|                                                                 
|DEM receive command now.                                     |                                                                 
|                                                             |                                                                 
|                                                             |                                                                 
|                                                             |                                                                 
|                                                             |                                                                 
|                                                             |                                                                 
+-------------------------------------------------------------+   

After the upload is finished, the switch should successfully reboot again and be factory reset.

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