Setup b20c

user_m6ihhb, Hi there! Thanks for taking the time to reach out. I can understand the importance of setting up a new Xfinity B20C. You've reached the right team of experts who can help with this over social media. To set up a new Xfinity B20C without iOS 17.2 on your iPhone 8 Plus, first ensure your phone has the latest available iOS version compatible with iPhone 8 Plus. Then, use the SIM quick transfer method: go to Settings > Cellular > Set Up Cellular, select Transfer from Nearby iPhone, and follow the prompts including entering the verification code from your old iPhone. Sign in with your Xfinity ID and password, and wait for the network to be ready. This process does not require iOS 17.2 specifically but the latest supported iOS for your device. Please let us know if this helps.