Well, I run it on single-boot loader by attaching toshiba by usb to my computer. i also reinstal MWSV12US when it crushes and repeat all steps again. I've read the discussion you sent me, but don't understand what "If you run a chmod 200 on the nk.bin before sending it to the Gigabeat, it will reboot nicely with the single bootloader." means. What is chmod 200?? The also say about it in step by step solution but don't understand this point. Thanks for help.