If you want to change your SAPSR3 users password, it’s so easy to do it via BRTOOLS on operating system level.
Open Command Prompt on the OS level ;
C:\>BRTOOLS
8 – Additional Functions
4 – Change password of database user
2 – Database user/password
Fill the related area with user SAPSR3 and password which you want to assign to this user.
And continue with “C”
Type and continue with “C” again..
When the process is completed then you can try the new password for the user SAPSR3
Also you can do this procedure with command prompt option like below ;
brconnect -c -l E -f chpass -o SAPSR3 -password <New Password>