Thanks for your post and welcome to the Rogers Community!
Being able to use everything that is included in your plan, with your new unlocked device, is a goal we want to help you achieve. We haven't had reports of users experiencing issues with that particular device, however, we don't officially support non-Rogers phones.
You indicated that you were unable to access Rogers LTE and 4G network. Therefore, if I understand correctly, you're able to connect to 3G, plus, you also have the ability to send and receive MMS.
If it is the case, the only thing you should edit is the specific APN input (all of the other settings should be fine).
These settings are to be programmed to a wireless device for LTE functionality on the Rogers Wireless Network.
For further assistance, please specify what has been entered in the APN Settings of your phone, so we can help you identify the cause of the problem.