Please, read everything before posting.
So i've started the 3DS hacking process and everything was running ok. (https://github.com/Plailect/Guide/wiki)But, when I downgraded to 9.2.0, it ended with a black screen that resolved easily when I changed the theme.
After that, when I downgraded to 2.1.0, again, ended up in black screen. The guide told me to put the SD card after launching the sysNAND. It loaded. However, the problem wasn' t resolved, after all. It continued to stay with a black screen and only connected without the SD card. I ignored the fact and I installed the arm9loaderhax. It was installed with no errors. Then, when I rebooted it, again: black screen.
If I delete the Luma3DS options will enter in LUMA3DS screen, but when I boot the 3DS, it will stay in the Black Screen.
Oh, and now if I take off the SD card it won't boot anyway.
How to proceed?
*sorry to my english, I'm Brazilian