Bricked (soft?) topic

I was running MF9 bootloader and stock rooted rom, with Philz recovery. Phone was working OK except for a weird thing with SMS's not registering on the phone. The phone spontaneously rebooted, but now it will only show the white Samsung logo on the black background before it powers back down. It doesn't make it to the yellow Sprint screen. To get it to restart, I have to pull the battery.

I have been able to get it into download mode by holding power and the down button. I can see the phone with Odin.

Next step? Flash recovery with Odin? Try flashing bootloader with Odin?

Thanks for any advice.