As mentioned earlier, there's the NSUI program used for making 3DS GBA VC injects that might be able to patch your rom savetype but I'm not sure how easy it would be. You'd probably need to unpack the forwarder you get with some program like GabrieloRomToolsGui in order to get the ROM afterwards.
So you're saying you extracted the sram patched rom from the .cia that nsui made and saving worked with gs2?
In other words, you extracted the ROM from your gs:tla .cia and used it with gbarunner2 and saving worked? Because it's not clear if you did that or if you just installed the cia and tested it with agb_firm.
I'm talking about taking that .cia, unpacking it with a tool like GabrieloRomToolsGui, and grabbing the gs:tla rom from the unpacked files, and running that with gbarunner2 to see if saving works.
Haha I see. Well then you only confirmed that saving works for gs:tla when played with agb_firm, which is the 3DS' native GBA mode, which doesn't exist on DSis, and has nothing to do with gbarunner2.
I just had a look at it myself and there's no option for sram patching, so the nsui way is out of the question. Do you have a 3DS? If yes then you can use NSUI to create a gba forwarder and gs:tla will work as on a gba, or you can use open_agb_firm, these are however unrelated to gbarunner2 and it would be better to ask about them in their respective places on this forum, in the 3ds part.
Ok, so if you have CFW on your 3DS then it is recommended to use either NSUI to make a .cia to use the native gba mode of your 3DS, or use open_agb_firm. Again, these are unreleated to gbarunner2 and you should ask about for help with them elsewhere.
