paperwhite 3 can't get KUAL

Hi All,
I've surfed through most of the posts on the forum and am stuck.

So far I've managed to downgrade, and Jailbreak my PW3 G090G105

But I can't get KUAL to work, no matter what I do.

I see details that mmk isn't needed, some that it is, etc.. Either way I put the update files for MMK, and KUAL onto the kindle and they just vanish without getting updated.

I know the update mechanism is working because I put an incorrect update file onto it, and I got a notice that I had put an invalid update on it.

I'd like to write out the steps I took and properly document the procedure once I get done, but I'm missing a key step here somewhere.

I'm on FW 5.7.4 if that makes any difference.