iPod Nano 2g Installation problem

[Teyphas]

Hi.
Yesterday checked Rockbox for new release and I've found that my version was kinda old. So I've downloaded new one, installed with Rockbox Utility (for some reason Complete Installation and Minimal Installation buttons are grayed out). After I've installed it, I've noticed iPod doesn't respond at all. And after I've restarted it, white screen appeared *Panic* And now it's not working, even after iTunes restore and fresh Rockbox Install.

Here's text on screen:
*PANIC*
Stkov 6B7D
bt pc: 0x08047EA8, sp: 0x080B(can't see anything)
     A: 0x08047F00
bt end

I have no idea what is this and how to fix it.
Thanks for your attention.