i just renamed: usb_kernel_root.img but i now get ER 5
i followed these instructions:
"1. do not plug the USB stick into your receiver yet
2. if necessary, switch on your IPbox; make sure it receives some program
3. switch the box into cold standby: on the front panel, press the I/O switch and the Ok switch simultaneously, the clock appears on your display
4. now, and no sooner, plug the USB stick into the USB slot on the rear of your IPbox
5. Push the front panel I/O switch and do not release it
6. Wait until "BOOTING" appears on your display (whilst still holding the I/O switch)
7. keep on pushing the I/O switch and press the Up key
8. "USB UPDATE" will appear on your display - release the front-panel buttons
9. ERASING will appear on your display, and a slowly incrementing number, this takes quite a while
10. FLASHING will appear on your display, and a slowly incrementing number, this also takes quite a while
11. Then, finally, "DONE" will be displayed: immediately switch of the box using the power switch on the rear
12. Remove the USB stick
13. Switch on your receiver, which will boot the new image
mfg http://www.imagineers.nl/hd900/#USBupdate"