Had the same problem. Copy paste the generated unlock code into a blank notepad document. You need to save the unlock file as SpongeBob.unl NOT SpongeBob.unl.txt. When you save the file change the dropdown to file type "All Files" and not ".txt".
You can check the file by right clicking and selecting properties. It should show as SpongeBob.unl and NOT SpongeBob.unl.txt.
VPM works fine on my Nuvi 255!



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