Hi GBATemp, long time lurker here. I think I bricked my SuperCardDSTwo, and need some help for the last attempts at reviving it.
The user updated the 3DS XL to 6.2.0-12E (I can't remember the previous version that was on it) by mistake. The SCDSTwo firmware was the 1.13 (Beta, apparently). The SCDSTwo would no longer work (obviously).
So I downloaded the latest version of the SCDSTwo firmware on the official website (1.23), then put it at the root of the SCDSTwo (nb: that micro SD card was formatted with SD Formatter 3.0 before being used in the 3DS).
Launched the SCDSTwo on a NDS Lite (v5 firmware, magenta screens when Pictochat->remove card), it successfully detected the dstwoupdate.dat file, then showed me a SCDSTwo menu asking me to confirm the "1.13 (Beta) -> 1.23 update", I confirmed (pressing A, iirc).
A loading bar filled up, then after no more than 5 seconds the SCDSTwo loaded up normally (showing roms, etc)(nb: the SCDSTwo was using the official EOS v1.11_2012_1212(2012-12-24), no plugins whatsoever, only files are .nds games and .sav files - as vanilla and simple as it can gets). There wasn't any "update finished !" message showed at all. After less than 5 minutes (around 2 minutes) I turned off the NDS Lite (this is maybe where it bricked ? It wasn't the dstwoupdateb.dat method though, so it shouldn't have caused problems).
I then tried the SCDSTwo on the 3DS: the card is not detected, nothing is showing. Immediately tried it again on the NDS Lite (v5), the SCDSTwo is no longer detected on it too, even after several attempts (turning it off and on, removing the micro-SD and putting it back, etc).
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Tried the dstwoupdateb.dat method (even if I can't launch it, just left it at the NDS Lite boot menu for 10 min), no change.
Tried formatting it with SD Formatter 3.0, putting a fresh EOS v1.11 and 1.23 firmware update, NDS Lite boot, no change (still nothing is detected).
Tried dstwo_load_NDSL.nds (using a 'Ninjapass Evolution X9 DS' flash card), it won't detect the SCDSTwo when inserted (I press B but nothing is happening).
Tried all previous methods with the 1.19 firmware dstwoupdate.dat, no change (still not detected).
Tried all previous methods by inserting the card before booting the 3DS/DS Lite, and after booting the 3DS/DS Lite, no change.
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It seems the SCDSTwo is bricked for good, however I'm still ready to try anything wild (it's already dead anyway). If you have any other ideas, please let me know