Welp, I had something go wrong and I am now updated to 9.7.
Well that's super crappy.. I just updated mine a few days ago using this method, and I was praying that these aren't crazy people on here just trying to trick me in to updating to to latest firmware so I can't hack N3DS any more.. But I did every thing correctly I guess (copy/pasted the codes so I didn't typo, and once I entered the system settings, I didn't exit back out or any thing)..
Fortunately for me it successfully updated to 9.2.0 (giant relief for me)..
The sucky thing about this method though, is that there is no way to verify that the 3 write codes actually did the change that they are supposed to.. I know the debugger says it wrote correctly, but I was thinking "How do I know it changed the right places in memory or not?"..
I have no idea why it didn't work for you and Death78793.. But I do know this is a really risky method, basically because if any thing is not done perfectly, it updates to the actual latest version, which of course means you can't hack 3DS any more..
But I am glad you at least backed-up 8.1.0 before trying this, but I think as of yet no one has found a way to hardwarely restore the NAND to N3DS yet..
As far as I can think, you have 4 options at this point, all of them crappy:
1: Wait until some one finally figures out how to hardware-restore the N3DS, then restore your 8.1.0 back-up..
2: Sell N3DS on internet; Buy new jap N3DS and try this method again (especially maybe if you know where some thing went wrong) and pray really hard..
3: Sell N3DS on internet; Buy new jap N3DS and stick with 8.1.0J for now, and just worry about features for 9.0-9.2 later when maybe more hacks have been found to help you update, or maybe ninjhax will be ported to 8.1.0 or some thing.. (Future problems have future solutions)..
4: Sell N3DS on internet; Buy an american N3DS so that you should (maybe) have 9.0-9.2 version, then you don't have to worry about this risky updating method.. Once it is hacked, you can still play all of your good old favorite 日本語 games even though it is an american console.. And if you feel like it, might even try some of those methods where you change the system region (at least I THINK maybe you can do that, but I don't know much about it.. Some thing to do with using things like FBI and deleting titles from NAND and installing new .cia files for the menu of the region you want..)
Any way, I feel sorry for you.. If my update would have gone to 9.7, I would have been very disillusioned as I am sure that you are right now.. I think gbatemp needs an emotional support thread for those who have bricked or otherwise messed up their consoles some how..
EDIT: Just wanted to say holy crap, you registered in 2003 and only 75 posts.. That is impressive..
EDIT 2: I did some more looking around and found out there supposedly is a way to restore sysnand to a N3DS.. I found information about it in this thread:
https://gbatemp.net/threads/n3ds-nand-backup-possible-i-hope.381506