For anyone who doesn't have the exploit getting removed, can you play DsiWare CIAs in Gateway mode?
No, as it doesn't have the patches to do so. Through the guide provided to make the DS Exploit stick, I was able to do it(for Gateway, select 9x Launcher.dat), I was able to make the exploit stick by following the directions.
Played Super Mario 64 DS on my Supercard DSTwo, still able to get into Gateway via DS Profile.
Then, I booted up Pasta CFW and played Zelda: Four Swords DSiWare, turned off system, turned back on, went to profile, still able to get into Gateway via DS Profile.
Booted up Pasta CFW, then Cubic Ninja for the Gateway Ninjhax exploit(MUCH easier than turning off the system to switch to your EmuNAND, booted into EmuNAND, turned system off, turned back on, went to profile, still able to get into Gateway via DS Profile.
Haven't tried GBA games yet, but from what I've done so far, it seems like I can't break it at all. So, all seems good.
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I just installed mset and timewarp cia on sysnand like everyone else. Didn't do anything extra and exploit doesn't get removed when launching blue card for some reason.
Also, I installed nvram AFTER the mset downgrade unlike on the gw website's guide. I never touched nvram install before downgrade. Maybe thats the reason but I don't think it is.
I did it the way Gateway said in their guide, NVRAM first, and then downgrade system settings. Following the guide made mine stick too. So, it's not that.