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This is before boruto movie and in boruto movie boruto not just cheated in his video game but also in the chunin exam, can someone explain why didn't Boruto cheat here?
IMO it's out of character
The better question is why don't you and salamander understand Boruto's whole conflict?
As you have stated, we know that Boruto has cheated in 2 areas:
1. Videogames
2. Chunin exams
Now let me address number 1 since that one is quick and easy:
Cheat codes aren't frowned upon by the gaming community at large when you're just casually playing videogames. Unless it's something like a tournament or competitive setting, then you can use cheat codes all you want. It is not a major thing. In fact, you can even buy actual cheat code devices, such as action replays, at mainstream videogame stores (like GameStop).
Now to number 2:
It is true that, up until the Momoshiki incident, Boruto was lazy and not into putting effort into things. Nobody can deny that. However, that issue was a secondary issue with him. The main conflict that the writers portrayed about Boruto was the fact that he hated the fact that Naruto didn't pay attention to him and his family.
In fact, Boruto says several lines in the movie such as:
(during narration) "...In short, he is the nanadaime (7th) hokage, but that is no excuse for him to ignore me"
(later, in Naruto's office after bear mission)
Boruto: "I've mastered fuuton, raiton and most recently suiton"
Naruto: "Konohamaru, what have you been teaching him?"
Boruto: "Don't blame my teacher! If you payed more attention to me..."
(when Naruto takes Boruto's headband)
Naruto: "There will be a lecture later"
Boruto: "Later?! Will you have time?! If you had just looked at me sooner..."
As you should hopefully be able to see, he was desperate for Naruto's attention.
That is why he cheated in the chunin exams. He wanted to impress Naruto.
He didn't cheat because he is a cheater in general. He cheated because he craved attention from Naruto, so you and salamander can stop acting as if his cheating in the movie means that he cheated in every aspect or facet of life!
The game of shinobi bout with the old lady wasn't nearly as important to him.