Default Trouble with mobile connection

Hey just a quick question. So I wanted to flash an old Paranoid Android ROM (4.3), but I had no mobile data nor the ability to make calls. I tried with a couple recoveries. Is this a matter of setting up the APN data, wrong recovery? I am currently on the newest firmware needed for TW 4.3 and 4.4.2. Would that even matter? Any help is appreciated.
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