Thank you!
But, hrm, have any advice on how should i update to 9.2? Should i use a game card, or install some homebrew and then use it to update?
If your 3DS is European, you could use Cooking Mama: Bon Appetit! and it would be way safer,
but since your 3DS is probably American, you can either follow
this part of the Google Docs guide to update to 9.2 from 7.2, or you could update to 10.3 and downgrade.
If you upgrade to 10.3, you need to find the 9.2 update CIAs from that ISO site (the 9.2.0U zip MD5 hash is 879f437d7c78f09ae565f79f5aa9c421) and extract them to an /updates/ folder on the root of your sd card. Then you
download this version of sysupdater and launch it from
the Homebrew Launcher (I'd suggest using browserhax and not installing menuhax yet).
Sometimes it doesn't work, so if you get stuck on something before getting to the screen that says
"A" Update
"Y" Downgrade
Then just restart.
However if you do get to that screen, then press Y to downgrade and wait. If you get stuck on the part that says "Rebooting in 10 seconds" after the CIAs install, then wait ten minutes before restarting, just to be safe.
After that, you'll be on 9.2. Go ahead and install menuhax and just follow the rest of the Google Docs guide.
By the way, I don't think anyone's bricked an O3DS using this version of sysupdater, but both ways still carry the risk of a brick, so be careful.