Upgrading LEDE on Asus RT-66u

This router does not have a special sysupgrade image. Is it possible to upgrade from an older LEDE version to a newer one with the one image available? If not, what's the best way to go about this?


Thanks. Both the designated factory install and upgrade links are identical. So for some routers, including this one, you can just flash the new image and don't need a special sysupgrade image? I am asking because I wasn't sure if the upgrade field on the tech data pages were just filled with the factory install image link by default if no other link had been set.


The instructions here indicate that you must either use a sysupgrade image or if one is not available, follow router-specific upgrade instructions, which are not available for this router as far as I could find.