I think that the problem here is that the path name has spaces in it and I've forgotten to put double quotes around the variable. I might have done this in a few other places, I'll check. EDIT: I've reproduced your directory structure and got the "not a .tar.bz file" error and after I fixed that the "cannot copy kernel" error. Both are caused by the problem mentioned above. I'll have a new version up later (I've fixed some of the other problems already) but if you want to try it now, try putting the firmware file on the root of the SD card so that there are no spaces in the path.