Well, I just finished doing all that and right now the game is giving back a different error. It now says "The additional data is broken. New data must be created" And when I choose "Create new data" it says "There is not enough space on the SD card. New data cannot be created." even though I have 5.1 Gb of free space on my MicroSD card.
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Oh, and after finishing the "Option (A) Quick" script, one more gray question mark appeared. However, two of the three gray question marks were able to be deleted. There is still one that says "Data could not be deleted"
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And, one more thing. Since I unbricked my New3DS, when I try to open the game "Steamworld Dig 2" I get an error that says "An exception has ocurred" "Processor: ARM11" "Exception type: Undefinided instruction". I don't know if it has something to do with all this