It sounds like you're looking for a way to unlock a tablet—likely a Tablet SEP model given to students (e.g., from the @prende.mx or Mi CompuMX programs).
You can call official support lines in various states for direct assistance: Mexico City / CDMX : Contact the local SEP technical assistance numbers. : (614) 429 3300, ext. 21000. Other States Quintana Roo also have dedicated regional lines Option 3: In-Person Support gobierno codigos de desbloqueo mexico tablet sep better