3DS issue with Pokemon DS (real cartridge + rom) connectivity. Works one way, doesn't the other?

[YamiJustin]

So I have a New 3DS XL which I have had Luma on for a long time. I play all my backups right off the SD card, right off the menu (used a forwarder I believe). My friend purchased a regular 3DS and I installed Luma on there for her. The goal was for both of us to play Pokemon HeartGold/SoulSilver alongside each other. But there's a big issue: when we both enter the "Union Room" we can't see each other. The rom of HeartGold is on her 3DS, and I'm using the physical cartridge.

At first I thought you -require- a DS cart inserted, but no, then this happened. I put the physical cart in the regular 3DS and ran a rom off my New 3DS XL (with no cart inserted) and it worked! They both see each other! This is driving me mad. Why does it work one way and not the other? If both systems have a physical cart inserted they work. I just can't get it to work with a rom on her end. The actual game plays perfectly fine without any other issues.

I am deleting Twilight Menu and probably gonna reinstall it and NDS Bootstrap.
Any ideas??

 

[Pk11]

Make sure that "Wi-Fi" is turned on in TWiLight Menu++ settings on both consoles (though especially the one having issues with the ROM), there was a bug a couple versions ago that turned off Wi-Fi for 3DS users. If you're using a forwarder this might not apply but I'd still check it anyways if TWiLight is installed.

Deleting TWiLight Menu++ and reinstalling should fix it too, assuming you actually delete the _nds folder.

 

[CoolMe]

when we both enter the "Union Room" we can't see each other

You need both 3DS to have WiFI ON(not internet),it's easy to tell by the led light indicator if it's on, in order to see each other in the union room. Also use TWilightmenu instead of the forwarder (for now) just to make sure it's not something else causing the problem. If it doesn't work, update TWilightmenu and test again.

 

[Pk11]

You need both 3DS to have WiFI ON(not internet),it's easy to tell by the led light indicator if it's on, in order to see each other in the union room. Also use TWilightmenu instead of the forwarder (for now) just to make sure it's not something else causing the problem. If it doesn't work, update TWilightmenu and test again.

fyi I think when TWiLight has Wi-Fi turned off on a 3DS the LED stays turned on for whatever reason, so make sure to check that too, even if the LED is on.

 

[CoolMe]

@Pk11 Interesting, I certainly didn't know that could happen.

 

[YamiJustin]

Thank you for the replies. I did have Wifi turned on, on both systems. Good news is it seems the 256gn SD card was giving me issues. A few times the PC and 3DS it wouldn’t even be detected.

I changed it to a 64gb SD and haven’t had any issues. Whether rom connecting to another rom or a cart. All seems to work (except for my Super Stable 3D and inner camera: they seem damaged).