Is there any way to dual boot on the international GT-n7000 phone ? I have no tried the CWM backup / restore to switchbetween two ROMs but I would guess no issue with that to be encountered. Just that it would be too cumbersome.
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The answer to your question is extremely complex and (in my opinion) not material for SE since there are a lot of files that you'd need to download and cannot be hosted here. Fortunately, XDA has a thread for multi-booting on the GT-N7000. I also found this tutorial on YouTube so that you can see how its done.