Software

Do the set-up fresh.
Reasons;
1) The older set-up might not be completely compatible, and you might not be aware, perhaps even leaving you with a vulnerability.
2) This will guarantee to you the control of the device is again with the proper administrators.
3) If the old device had been compromised with-out being detected, just transferring the 'old' settings might cause the comprise to continue.

Fresh, new, device should give you a fresh start. IMHO, of course. -d