I noticed Linksys has the refurbished ea6400 for $29, it's not supported by LEDE and only iffy support on dd-wrt dependent entirely on if you get a box with the old firmware on it before the digital signature, but it seems to have some decent hardware for that price so i'm wondering if it's possible to do a serial flash with lede on these digitally signed linksys, would anyone happen to know?
edit - never mind, i see that it can be flashed from serial with merlin and dd only.