Which boot 2 version do I have?

I want to know which boot2 version I have But I'm not sure how.

does bootmii show when you turn on your wii with your sd card inserted?

He means boot2vx.

Are you running 4.2? Have you installed the NSMBWii update from the disc? If so, you have boot2v4.

Otherwise, you have boot2v2, v3, or v4. Ceiling Cat can tell you the version.

It actually doesn't matter all that much.

I guess I have boot2v4 because I updated to 4.2 yesterday. but I installed bootmii again.

Yeah you have v4. But it makes no difference what version you have so dont worry about it too much.