FalsAlarm

My friend brought me his iPad, he doesn't know which iPad version or iOs version is on it either. Furthermore, he's locked out of his email account and icloud password. He factory reset it using traditional method via itunes but after it booted up it's still not working, asking for icloud password for previous account which he doesn't know it anymore because he set it up so long ago. After reading around the internet, it called FRP Bypass or iCloud locked. Is there any realy way of bypassing this type of locked device? I already tried the DNS bypass and it's not good enough, we want it back again. I heard of a method whereby you downgrade the ios version to ios 6 and then hack passed it somehow. One more thing, how do I find out the iOS version with only the emergency dialer and the icloud locked state that it's in?