Problem with multirom topic

Hello, I have tried the last version of multirom and I can´t make it boot using Cromix as primary room, I'm using thats kernel V4. I also tried to go back to the first version but the recovery was not able to flash it. Finally I had to flash TWRP 2.5 through fastboot and delete multirom to be able to boot again into Cromix.
Some people are able to boot using Cromix. I don´t know what I´m doing wrong.

Thank you.