Solution : https://service.sap.com/sap/support/notes/722879 (SAP Service marketplace login required)
Key words : 
parameter/option 'recov_type/-t', oracle rac databases, symptom missing support, terms br tools, br tools 6, missing functions, missing function, recovery attempt, error message, brrecover reason
Related Notes : 
       
| 680046 | Corrections in BR*Tools Version 6.40 |