I'm running FW 3.2.1 . I used yifanlu's jailbreak and it worked. Then I tried to install MKK, I used "Update_jailbreak_0.13.N_k3w-3.0-to-3.2_install.bin" and it didn't successfully install with a error code of U004. I've registered my kindle and tried to reboot several times, still didn't work. Now, if I launch KUAL, it just gives me the not test kindle error. What should I do? Thanks