How get supervisor od root password of NR7103 modem?

i have a DX3301 and i need the admin password.

Serial number S220Y43048222

thank you very much.

Hello, i installed the wrong firmware to my router and the router does not accept my admin password. for this reason, i need the supervisor password. can you help me? i sent you my router serial number via PM. thanks.

Hello, I need the pass for S/N S220Y03124780

Thank you in advance