Catch 22 then... Because once you go 4.4.2 you won't be able to downgrade anyway. BTW, at least until recently, the phone comes with 4.2.2 and immediately updates to 4.4 so you shouldn't have to downgrade if you want to try all that. Here's the other thing you should know... You have 2 weeks to return of exchange the phone (30 days in California) from the day you got it. You unlock and root and do all that and find an issue you can return it regardless of have it replaced. I know because I had to do that... My moto maker x was also boot loader unlocked and I got my money back.
Its not all that likely you will get something wrong with the phone past the initial period but it's up to you. You are more likely to break the phone trying to root exploit than it breaking past 2 weeks out of warranty.
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