I recently bought some used Omada devices which are:

- ER605 Router

- OC200 Controller

- TL-SG2008P Switch

- EAP610 Access Point

I'm wondering if it is safe to buy these devices from secondhand markets or if there is a risk that they may have been tampered with, such as having malware or backdoors.

What can I do to sanitize them? Is a factory reset the most I can do before deploying them on my network?

Thank you.