Wifi worked on OEM firmware (2.1.2 Build 080321 Rel.63639n), but it did not work after installing Lede 17.01.4. ART seems to be erased.
It seems to contain 8MiB flash (m25p64 according to logs). Could it happen that the original firmware fit into 4MB and the ART was placed at the end of the lower half?
I've installed OpenWrt and Lede on numerous hardware before with success. I've also bricked a few and fixed a few in the past using serial and TFTP by reset recovery, but I've never seen anything like this.