Resolution:
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1) you can do it manually, remove the data which are within the following files:

demos/conf/demo_accounts.xml
demos/conf/demo_data.xml
demos/conf/bsc_demo_data.xml

2) or you can use the following scenario using setup tool bin/setup.(bat|sh)
Backup -> Data
Database -> Drop schema
Database -> Create schema -> unselect "install demo data"
Restore -> Data
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