4.2 vs 5.0

I have both 4.2 and 5.0 wifi connections, and I do want to keep them separate. My 5.0 seems to always be available, but not so my 4.2. I need the 4.2 to manage my Blink security cams. How do I enable both 5.0 and 4.2. I have spent hours on tech support to no avail. Help please.