Just putting in my 2-cents.
I have an NTSC-US D2A drive with a WiiKey...probably a clone.
I updated to 1.9g a few days after updating to 1.9b with no problems.
The 1.3 config disk wouldn't load with 1.9b (tried multi-times on 2 different burns)
but
the same disk will load with 1.9g
So -...
