A few comments:
At a minimum, the proper instructions for getting into APX mode (the 10-second button combo sequence) and for flashing a new bootloader should be on your Web site. As it is, there are instructions for saving various partitions, without ever explaining why the data is important, or how to restore it.
There should also be a warning that flashing the bootloader with nvflash prevents it from ever being flashed with fastboot again. I found that out the hard way. I suspect there's a way to get that working again (i.e. flashing in secure boot mode), but you would need to post instructions for doing that.