Is there any way, how to make dualboot on android device?
There was a few apps in early android day's, but it takes too much memory..

You're better off just using a nan droid backup and restore between systems !

If you just swap system and boot, it'll be quicker and you can work on as many ROMs as you want !

I used to run CM9 CM11 and CM12 when i was still working out CM 12