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They might send back a refurbished console though. In which case their NAND backup will be useless :-/
if you install the clean one, yes
and different workers might be more strict or whatever, i doubt we would get the same result 100% of the time, maybe though.
If you think about it for more than a minute, the point is moot, really. First rule in customer support is usually: never believe what the customer tells you, check yourself. (This more borne of customer ignorance than customer malice, because most customers think they know better what's wrong when they have no clue at all.)
So when a 3DS comes in at repairs, it's placed into two broad categories:
1. Is hardware damage exceeding a certain level?
If yes, try to get it to turn on and system transfer to a new unit. If that's not possible, call the NNID guys to transfer all licenses from [Broken Console]'s serial to [Replacement Console]'s serial. Your 3DS lands in the trash.
2. Is hardware damage small / the fault not readily apparent?
Hook it up to your hardware diagnostics set and let it test all hardware functions while you fetch the replacement parts. Hardware includes the NAND storage, and you can bet your ass it will check it for data corruption. That's why we have two FIRM copies on the NAND at all, because they expect corruptions occasionally.
And what will they find immediately on a A9LH console? A corrupted FIRM image. (Since most of the NAND is encrypted and the FIRMs are in plain text, it's really the only thing they can check quickly and automatically.) The FIRM partitions are the same across all 3DSes, so it's trivial to check it against a database of legit hashes. I wouldn't even be surprised if the diagnostics program would automatically overwrite the FIRM0FIRM1 partitions with a legit one when it's "damaged", as routine repair. They don't even need to know it's an A9LH set up, they just notice a partially corrupted FIRM on NAND and fix it.
So now you either get a completely new console back on the highest firmware, or you get your old console updated to the highest firmware, with the exploit "accidentally" removed.
Not much of a difference.
Can they tho? How they unlink a NNID from the console if it has any and can't access it?
Well, they can't unlink it on the console itself, but they can unlink it on Nintendo's own servers. It's made so in case your 3DS gets stolen or is FUBAR after your warranty is over, you can call them, give the NNID information, old and new console serial number, some verification and then they can unlink the old console, and within 2 days you can log in with the NNID on a new console.
How come if you have one console and send that one only? Do they even know how to contact you?
- use the original packaging where possible;
- provide a description of the defect;
- attach a copy of your proof of purchase, ensuring that it contains the date of purchase of the Product; and
- ensure that it is received by Nintendo within 30 days of the original notification of a qualifying defect.
Well, what I described was for case where you call them for a transfer in case of theft/out of warranty defect.
If you send it to them then they already have the Serial Number (which is all they need), it's on the back of the console, and even if it's removed they more than likely have it also somewhere inside the console.
The thing I was saying in the first post I made was what if they can't access the console? Would they know that there is a NNID linked? But yeah I see your points which are right
Oh, then to anwer: more than likely, by checking if the console's serial number is tied to any NNID on their server.
