I didn't read all your posts, so just a quick question.
I see you're speaking about a gw payload, is there a .bin available for start with Luma3DS and 11.X SysNand ?
There's a stage0x5C000.bin for manual injection into your NAND dump (at the 0x5A000 position, aka 0x0B400000). It works with a modified compile of DarkSamus's A9LH. liomajor posted the modified .c file on page 5 I think it was. So far I have it working great on my N3DS XL (USA, bricked the AUS one doing something stupid), but giving a red screen and shutting off on both O3DS XLs.
You will need to compile the A9LH installer first though. It requires you to go back to 9.2, so, you'll have backup your SysNAND, restore something like SysNAND_original.bin normally, run your compiled installer via a *hax (it hangs at "exploiting arm9" about 50% of the time I might add -- you might want to temporarily replace boot.3dsx with it), restore your current NAND with "keep A9LH", then dump your SysNAND again, copy it to your PC, patch the stage 2 payload, copy it back, then restore normally. Not as time-consuming as installing A9LH, but close. Worth it when it works though.
Not as simple as I was hoping for, but, it's not really that difficult to compile. Just basically needs Python 2.7, Pycrypto, and DevKitPro ARM r45 (needs ctrulib too, but that's included in Devkit). Also, you do need a couple of decrypted firmware files, the secret sector file, and your otp.bin to compile it. With those in place though, it's just a matter of entering "make" at the command prompt, then look in "data_output" for the .3dsx file. It appears to be a complete solution. If it will run 3.7.1, it should theoretically be capable of running any GW Launcher.dat -- past, present, and future.
I only have this when either memory card or \Launcher.dat is not present. I 've tested with launcher.dat 3.7.1 and 4.0a
OK, there definitely appears to be something O3DS-related now. Red/black and Zelda both just give a red screen and shut off. N3DS works just fine though. And indeed, even 3.7.1 works. It's a beautiful thing (on my N3DS anyway). And I've tried formatting a spare card I have laying around and just putting the launcher on it. Put it in all 3 systems (it's a microSD, I used an adapter with the O3DS XLs). Got the GW menu on the N3DS XL. Got a red screen and shutdown on both O3DS XLs. That rules out the card. There's something causing it not to run on the O3DS. Maybe the issue only shows up if you try to use button B for some reason, and doesn't if you use A. Actually, the home button mapping in Safe A9LH gave me the same results. But it would only red screen every other time.