You are very lucky. If you were using an N3DS you would be bricked (O3DS might have a chance at bricking too).

Never ever update in Gateway sysNAND mode. Download play will update your console to the version of the cartridge (and maybe to the update already downloaded).

You will need a hardmod or DSiWare hax to restore your NAND backup.

 

Who knows. I guess maybe they don't want to do work if it doesn't mean increased sales (it would just make things easier for current owners, probably won't make new people buy it). Or else it hurts their ego to follow the free devs instead of creating new things.

 

Some people decide to keep using it because they're OK with current setting and don't want to change.
Some people feels like they should keep using it to makeing up for the price they paid.

I understand the choice they made, but whenever I saw people get the problem from a flow of GW.
Sometimes they still can recover, sometimes they're just losing the ability to pirate, sometimes they got bricked.
It make me feel pity about them. Why would they have to face a bad situation for the product they paid for?

Well, hoping the OP can find a way to escape this mess.

 

Things like this are why I recommend injecting sudokuhax to the DS Internet Settings as soon as you have the opportunity to.

 

You'll be able to restore a hacked NAND backup, even if you update to 11.1 OFW.
It's like a hardmod, except your console must be able to boot for it to work.

 

I'd say so, just in case you make a mistake like our unfortunate OP.
You just have to copy two files into your sysnand, you can use FBI or Godmode9 or anything. Dunno if an up to date guide has been written utilizing those tools.

 

Rough guide;

Get your hands on the .nds for sudokuhax, fieldrunners, guitar hero or one of the other dsiware games with exploits. The .cia won't do; however, if you install the .cia then you can navigate to its install directory and get the .app there, which is the same thing.
Get the appropriate. sav exploit.

Go to TWLN:/title/00030005/42383841/content and overwrite the .app file there with your dsiware rom. It needs to have the exact same name, 00000002.app.
Write the save exploit to TWLN:/title/00030005/42383841/data as public.sav

The DS connections option in system settings should now be replaced with the game, and be able to boot the exploit.

Btw a N3DS updated without properly uninstalling a9lh will be a brick. So don't count on this method protecting you from that.

 

Yes. I used to use it on OFW for reinstalling the MSET exploit way before a9lh was a thing.

 

ive done everything as you told me but i get a white screen once i enter DS connections option in system settings.

 

may i ask why do you have the US one dont you need the euro one if you are in UK, like me?