Kali USB Boot from RPi3

Hi,

I have been experiencing some problems trying to get Kali Linux to boot from USB on the RPi3. I already have Raspbian booting from USB but I wanted to try Kali. I burned the correct image for Kali to the USB drive, removed the Raspbian USB drive and then plugged it in.

It started booting , put would simply not get past "random: nonblocking pool is initialized".

Any suggestions?

I tried adding program_usb_boot_mode = 1 to the cmdline file, but that didn't do anything and it still won't get past it.

Thanks so much.