I am trying to register my BlackWidow Elite Keyboard's Warranty but, says the serial number invalid. | Razer Insider
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I have tried IO and io, neither have worked. What can I do?
I have the same/similar problem. Trying to register new Blackwidow keyboard and get "serial number is not known".



First character looks like either upper case i or lowercase L e.g. I or l neither work.
JoeyIsAZN24
I have tried IO and io, neither have worked. What can I do?




try uppercase i then uppercase o as the first two characters of your serial number. I had same problem, thinking the second character was a zero, it weasn't.

Best of luck
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