How to uninstall & reinstall without software

WD External Drives WD Portable Drives
1

I had to create a new profile on my computer. Now, my Passport Ultra won’t backup. How do I reinstall?

2

Hello,

You will need to reinstall the backup software again. If you don’t have the application pre-loaded on the drive, you can download that from the support site.

See if the following link helps:
http://support.wdc.com/product.aspx?ID=232&lang=en