Sorry
@CrossOut ,but in fact, to create codes i follow the video you inserted in your post,but you don't always have to follow it to the letter(i'll give you an example that is also in the attached screenshot).
As you can see there are 2 lines for a unique code, because i first found a code, but saving the game and then continuing it didn't work anymore,i did the search again and i found another code that differed by a letter,saved the game again and same result as what i wrote before.
So i tried to put all 2 codes together save the game and the cheats and this time when continue game it worked and they became stable.
All this,to say that if you find not many codes,but about ten you should enter them all together in the same cheat,maybe a tutorial so don't exists!