Cannot transfer RID master to main DC

For some reasons today the zone transfer between 2 DCs was not working in my lab. I tried with ntdsutils and I could not transfer the role. For this case a forced removal of the DC took care of the problem.
PS: only do that if you cannot transfer FSMO roles and if you cannot replicate in Active Directory Domain and Sites.
Steps:
1) DCPROMO /forceremoval
2) Active Directory users and computers: go to Domain Controllers, delete the damaged DC
3) Then it will ask you if you want to transfer the remaining roles to the schema master. Click yes.
done

Run netdom query fsmo to check that all the roles have been transfered :)

Re-install the damaged DC with DCPROMO