Avérer
"Avérer" means "which is recognized as true". In verb root, there is the word "vrai" which means true. So it is not correct to write "*il s'est avéré faux". This introduces a contradiction. Additionnaly, "*il s'est avéré vrai" is a pleonasm. But in this case "s'avérer" can be replaced by "se révéler".
Verb conjugation has a change in the accent from acute to grave.
je m'avère
tu t'avères
il s'avère
nous nous avérons
vous vous avérez
ils s'avèrent