can not uninstall sansa clip zip bootloader

I am a visually impaired person. I have a Sansa clip zip MP3 player. I 
am trying to restore it back to the factory settings. I want to remove 
the bootloader and then rockbox so I can give it to my sighted sister. 
however, I keep getting the following error message you see below. What 
can I do to resolve this issue Thanks.



List box Rockbox Utility can not uninstall the bootloader on this 
target. Try a normal firmware update to remove the booloader.

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