It seems this is what happened
Those ninja tools created by the science division in Konoha allow ppl to use ninjutsu even if they aren't ninjas. Naruto prohibited the usage of these b/c he thought that;s not real power/strength.
In the second round of the chunin exam, Boruto was victorious and Naruto complimented him
he was so happy he cried
In the third round he didn't want to lose and he used them
Credits:Jpropro
Those ninja tools created by the science division in Konoha allow ppl to use ninjutsu even if they aren't ninjas. Naruto prohibited the usage of these b/c he thought that;s not real power/strength.
In the second round of the chunin exam, Boruto was victorious and Naruto complimented him
he was so happy he cried
In the third round he didn't want to lose and he used them
Credits:Jpropro