Waiting for device...
Preparing to copy nv_data.bin to sd...
rm failed for /sdcard/nv_data.bin, Read-only file system
Copying nv_data.bin to sd...
cannot create /sdcard/nv_data.bin: read-only file system
remote object '/sdcard/nv_data.bin' does not exist
Unlock code: FFFFFFFF
So, my question is really this. Will factory reset re-lock the phone?
Update: I took the plunge and went ahead with the factory unlock. After it rebooted, it was true to word reset. Except that it DID remain UNLOCKED. That was good to know.