It possible to change ownership email if factory reset the Fortigate 50E

Hi everyone, I need some advice regarding my FortiGate 50E.
I recently purchased a FortiGate 50E device, and it seems it was previously registered using someone else's email address. I’ve already bought a new license for this device under my own account, but now I’m unable to claim ownership or re-register it because it’s still tied to the old email.

I contacted the local partner for support, but they mentioned that they need a PO document from the company that originally registered it — which I don’t have.

Just wondering:
If I perform a factory reset on the FortiGate, will that allow me to change the registered email or re-claim ownership under my account?

Any suggestions or experiences would be appreciated. Thank you!