I bought this router in hopes to get the V3, but they must recently have added a V4.
I made pictures of the SoC and the board the way they are in the ToH, but i am no developer and i have absolutely ZERO idea how to add the device there. From the looks of it, it should support OpenWRT just fine sice its still a MediaTek chip, just like the old one.
for reference here are the pictures:
can only post one here, since i'm a new user, but i have pictures of the whole board, not just the SoC