Adding on to this, if you're using an o3DS, it's better to just inject GBA ROMs into VC titles. I have an o3DS and have little to no issues running GBA VC titles.
Perhaps he's on 9.3-10.7 though, but still, there's no excuse not to downgrade to do what you said!
VC stands for Virtual Console. You can use PC tools to inject a GBA ROM into a GBA VC CIA. And then you install the injected VC CIA onto your 3DS to both sysnand and emunand, making sure you also have a patched AGB_FIRM on both nands in the process.
If you use the custom gba vc only on emunand, you dont need to patch the agb_firm on sysnand. But of course, it depends where you want to use your gba titles.
Booting them from emunand has never been successful for me (what I posted was info I gained from another user a few days ago), however sysnand always seems to be the only nand I can boot them from. :/
it has to do with the cfw you are using, not all are identical and only works almost the same. At least for me, booting gba and dsi titles from rxtools 2.6 works fine.
iirc, I tried booting them from an rxtools 3.0 nightly. That was where the VC CIAs weren't working, not even with everything set up correctly.
hmm i cant tell how the 3.0 nightlies work, im so used to 2.6
Not really... all you have to do is run rxtools dev mode (it patches gba and dsi firms on-the-fly) and install the Custom GBA CIAs, and you should be good to go, I guess. Well, that's if you plan to boot them from sysnand only...
You can either make your own vc cia or find one on the interwebs
Well I was hoping to make my own VC CIA for a hacked pokemon rom.
