I also have an N810 WiMAX and was trying to get bootloader working. @tomstratton, I have a few questions. You choose not to remove the extra utilities in the initfs, and also installed dropbear and utelnetd. What was the size of your initfs partition? Mine is 4M, and the generated initfs file is close to 6M and won't fit in. I had to unselect telnet and ssh while creating the initfs file. I also got bootmenu to work the first time. Thanks fanoush for updating it!