How would you degrade to a lower version? I tried doing it before until it stopped working and it turned out that my card was defective.
I just want to be safe in degrading again but I'm not sure, if that might be what caused the card to become like that in the first place.
You can downgrade the launcher.dat without any problem, just replace the launcher.dat file at your 3DS SD card.
And so far, no launcher.dat or any archive at all modifies your gateway card, so your problems are probably a hardware failure, you can try using the 2.0b1 launcher.dat with the diagnostics tool and ROM to try to restore the gateway card program. Or even better, try to use the 1.2 version of launcher.dat, but this one doesn't have any graphical interface at all to diagnostics mode, you'll need to see how the gateway led blinks.
Unfortunately we can't give direct links to older versions of launcher.dat









