Broadcom CFE backup

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How to backup your CFE

So you're afraid you will ever need to use a backup of your CFE in case you brick your router sooner or later.

If you own a Linksys WRT54G/GL/GS and your CFE is already screwed, you could try the Skynet repairkit to make yourself a new CFE.

There are two methods to backup the CFE, as follows:

by web interface

this is working with dd-wrt post RC5 svn8428 backing up your cfe is easy, all you need to do is to point your browser to:

http://router_ip/backup/cfe.bin


by telnet/SSH

just enter the following command for all, except micro builds:

dd if=/dev/mtd/0 of=/tmp/cfe.bin

Then get the files with, for example using WinSCP, from the /tmp directory.


On micro builds it's little more tricky:

cat /dev/mtd/0 > /tmp/www/cfe.jpg

Then point your browser to http://routerip/user/cfe.jpg and do a "save page as" cfe.bin to your disk drive. The resulting file should be 256K in size for a cfe.bin file.

Note: "/user/cfe.jpg" points to "/tmp/www/cfe.jpg"


You could do the same for mtd/1 (kernel, firmware), mtd/2 (jffs part if any) and mtd/3 (nvram)

by JTAG

this assumes you already have a JTAG cable ready to use on your router, use the following command:

wrt54g -backup:cfe