N.M. Stat. § 45-3-302
Informal probate; duty of court; effect of informal probate.
Upon receipt of an application requesting informal probate of a will, the probate or
the district court, upon making the findings required by Section 45-3-303 NMSA 1978,
shall issue a written statement of informal probate if at least one hundred twenty hours
have elapsed since the decedent's death. Informal probate is conclusive as to all
persons until superseded by an order in a formal testacy proceeding. No defect in the
application or procedure relating thereto which leads to informal probate of a will
renders the probate void.