If you have bootmii files on your SD card, remove them (copy them to a computer in case you need them later).
Bootmii installed as boot2 will run the bootmii files on SD card on boot. That's how it makes a powerful anti-brick measure. It lets you get access to restore system memory from backup.
In normal use, you don't want it to run, so back that stuff up and get it off your card.