Hi ,
I did this in this sequence ,Please check. I hope one restart is required for the step.
Changing the sidadm password and orasid password
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alter user system identified by xxxx2020;
exit
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brconnect -u system/xxxx2020 -f chpass -o sapsr3 -p xxxx2020
INSERT INTO "OPS$EADADM".SAPUSER VALUES ('SAPSR3', 'xxxx2020');