CM11 rooted phone I want to sell. What's best way for me to secure it? I know there's a sticky somewhere for resale advice, but that doesn't address rooted ones.
Thanks
Yeah, root won't make a difference if all you need is a secure wipe.
Will a FDR erase CM?
No, you would need to flash another non-CM ROM or stock ROM (assuming it's not the OnePlus One) for the device to get rid of it.
If you do that, you will lose root (not that it's hard to regain root on most devices these days). If you really want to get it back to near pristine/original condition, you could also flash the original recovery.