I just got a Western Digital N750 router. I went through the steps on the wiki about how to install Lede. I got to the part where I should go to the router's admin page. I went to Advanced_Settings>Admin>Firmware_update. I then uploaded the factory.bin file, but got an error:
firmware upload fail.
Invalid image file. Please select the correct image and upload it again
(And yes, I did verify check256sums)