For those still having trouble, this will enable you to skip the step entirely:
https://github.com/simonmkwii/GenRSAKEK
It generates the key legally via a maths equation, a la Wii Common Key generator.
https://github.com/simonmkwii/GenRSAKEK
It generates the key legally via a maths equation, a la Wii Common Key generator.