I was viewing the root tutorial over at XDA and came across this:
Quote:
This will back up your rsa keys and is not required. If you DONT want to do this then you can Proceed to Step 7. Otherwise if your still at the # type the following to back up your keys.
Run this command first
cat /dev/mtd/mtd0 > /sdcard/wimax.img
This saves it in a file that can actually be restored. This next step is another type of backup just for good measure
busybox sed -n '/BEGIN CERTIFICATE/,$p' /dev/mtd/mtd0 > /sdcard/rsa_OEM.key
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So looks like you need to run:
cat /dev/mtd/mtd0 > /sdcard/wimax.img
In order to save it in a format that can be restored. I just did this and it worked great. The .img came out to be like 12MB in size.