Not sure about the password, just in case try with Admin123
The below are to reset password
1.Open NQSConfig.INI file
2.Go to Security part and find AUTHENTICATION_TYPE = BYPASS_NQS;
3.Uncomment (remove #) this part.
4.Stop the BI Server service
5.Close Administration Tool, if opened. (Then only the changes are affecting to the Administration Tool)
6.Open Administration Tool, then rpd which needs password reset, in offline mode
7.Give any password, it accepts.
8.Now go to Manage > Security.
9.From here it’s the normal process how you change password.
10.Save the changes to rpd
11.Revert back the changes in NQSConfig.INI
12.Start BI Server and open rpd with new password.