I have a factory replacement nexus 5. I though I could just make a backup of my old phone and flash it onto my new one. So I did that. However, I ticked the box for EFS backup, and then I restored my old EFS onto my new phone, which has essentially bricked it.
Before I did that, though, I created a backup of the new phone including its EFS. So as you may have guessed, I'm currently busting my ass trying to recover the data that has been erased. I'm attempting to use this guide
I understand most of what it's attempting to do. I've checked the location of busybox, I've entered these commands hundreds of times now. My issue seems to be dd commands are not working.
dd if=/dev/block/mmcblk0p10 of=/dev/null