But e.g. here https://www.snbforums.com/threads/adding-another-ac66u_b1-into-aimesh-with-ac66u_b1-ac68u-fails.54460/#post-463063
#zunfire got H/W Ver.:B1 working but not B2. It looks that some of the RT-AC66U B1 H/W Ver.:B2 versions are working fine and some not. It seems that I need to replace...