[Router] I want to use my Frontier Fios wireless router with Spectrum modem

I have a Frontier Fios (formerly Verizon fios router) Actiontec MI42WR Rev 1 wireless router I bought when I had their service, that I would like to use with the new Spectrum E31U2V1 modem I have. Is there a way to change the settings to do so. Ive already tried connecting the Spectrum modem to the Frontier router through the WAN port but the Frontier router won't connect to the internet.