[HELP] Backup Bootloader and NVRAM Linksys EA6900

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DarrellKitchen
DD-WRT Novice


Joined: 23 May 2015
Posts: 6
PostPosted: Tue Jun 30, 2015 2:28    Post subject: [HELP] Backup Bootloader and NVRAM Linksys EA6900 Reply with quote
I'm in my router over the JTAG port on the router's motherboard with Putty-via-COM3. Logged into the Admin account, su root, and I want to know how I can backup the bootloader and NVRAM in case something goes horribly wrong.

I found, via google search for "backing up router firmware" this command: dd if=/dev/mtd5 of=backup.bin, which I executed and TFTP'd to my local computer.

How can I do this to just the bootloader and NVRAM?

tjtag wont run on my computer so that is not an option.
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DarrellKitchen
DD-WRT Novice


Joined: 23 May 2015
Posts: 6
PostPosted: Tue Jun 30, 2015 3:54    Post subject: NVRAM Reply with quote
Okay, I just did a "nvram show > /tmp/nvram.dat" and tftp'd the nvram.dat file to my local computer.

Will this file suffice as a nvram backup? Can it be used to replace the nvram? Is replacing the nvram even an option in the case of a catastrophic event?
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Lonix
DD-WRT Novice


Joined: 20 Sep 2015
Posts: 5
PostPosted: Wed Sep 23, 2015 7:32    Post subject: Reply with quote
in Tomato you can type

nvram backup <filename>

and to restore

nvram restore <filename>

is this funtionality available in dd-wrt?

http://repo.or.cz/w/tomato.git/blob/4d3bf5bd0cf87d6f5702cb187514af63e240df70:/release/src/router/nvram/nvram.c
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Ah-Pin-Kor
DD-WRT User


Joined: 19 Sep 2015
Posts: 267
PostPosted: Wed Sep 23, 2015 8:22    Post subject: Reply with quote
cat /proc/mtd

usually boot/cfe is mtd0

cat /dev/mtd0 > /tmp/boot.bin

check the output of "cat /proc/mtd" above for the nvram partition

cat /dev/mtdX > /tmp/nvram.bin (where X is a digit)
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