What is the region of your 3DS? Which format? Classic? XL? (LL in japan)
Japanese firmware is 9.1.0.20, so that may be the problem?
Did you use the "Format Emunand" function? If yes, the SD card is formatted and if I'm right, preinstalled games are stocked on the SD card so that may be the problem.
About the 3D light, I don't know. I just know XL (LL in japan) 3D light is off when it's disabled, contrary to regular 3DS where the 3D light is on even when the slider is off.
Parental control can also block the 3D, so you might want to check that.
I also saw a report of someone that said his system nand got updated to 9.0 when he did the online update, but he was using the 2.2 launcher version and so, that might be why he got this bug (link here :
http://www.maxconsole.com/maxcon_fo...d-9-0-0-20U-will-put-you-on-OFFICIAL-FIRMWARE), because people who updated to 9.x with 2.3b launcher didn't got their system nand updated, just got a bricked emunand.
yea but that doesnt help me update, lol.. im not worried about the internet anyways since i havent even accepted the terms of service yet.
So basically, you don't need emunand 9.x. The only interesting feature is the access to eshop (for games that require an update to play online). If you don't use internet connection with your 3DS, 8.1 (updated offline with Smash Bros) is fine.
The new emuNand (9.0-20) is a little bit laggy here
It's takes more time to load icons
Same on real 9.x firmware. The icons appears a few seconds after the icon of the cart game.