Cat 3750 xmodem upload errors

[nick.welsh]

I have had a problem while uploading my cat 3750 with new IOS image. I have had to upload .bin file via xmodem (!! very slow) when issue the boot command get error

switch: boot flash:c3750-ipbase-mz.122-25.SEE.bin

Loading "flash:c3750-ipbase-mz.122-25.SEE.bin"...flash:c3750-ipbase-mz.122-25.SEE.bin: ma

gic number mismatch: bad mzip file

Error loading "flash:c3750-ipbase-mz.122-25.SEE.bin"

Interrupt within 5 seconds to abort boot process.

Boot process failed...

what have i missed? tried a number of different versions of IOS same problem.

[Roberto Salazar]

A magic number mismatch error is seen when the IOS image is corrupted or a .tar file is uploaded through an x-modem. To resolve the issue, you will have to upload the .bin file to the switch through the x-modem.

Make sure that the file you are booting is the right one and it's not corrupted.

You can check the recovery procedure at the following links:

http://www.cisco.com/en/US/partner/products/hw/switches/ps628/products_tech_

note09186a0080169696.shtml#subtopic1a

Here are the instructions also.

Once you have the IOS loaded to your computer then you will have to connect to the console

port using hyper terminal and issue the following commands:

Switch:Flash_init

Switch:load_helper

Switch:copy xmodem:filename.bin flash:filename.bin

Then you will have to click on Transfer -->send file -->Browse for the filename,

select and click on open-->Choose protocol XMODEM-->click on send

This will start the process.

Switch:boot flash:filename.bin

[jgross]

Hello,

when you upload a image to a switch via console and xmodem you should use crc check. this is the -c flag.

You can increase the speed by using the -s commang. So to upload a image with CRC Check at a speed of 38400 you use

rommon 4 > xmodem -cs 38400

Bye

Jo