Hexadecimal digits don't need to preceded by '0x'.
For example,
64-bits with characters WEP key :
Key1= 2e3f4
Key2= 5y7js
Key3= 24fg7
Key4= 98jui
64-bits with hexadecimal digits WEP key :
Key1= 123456789A
Key2= 23456789AB
Key3= 3456789ABC
Key4= 456789ABCD
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