V4A. V6A and A2A are the "lost generation" of AVRs. Those currently do not have HDMI 2.1 functioning boards, free board replacement programme was announce by Yamaha in May for those who need it, and, once replaced, new boards will run HDMi ports at 24 Gbps. Not very future-proof, I am afraid. Plus, those AVRs support DSC over HDMI 2.1, but most 4K/120 TVs do not have DSC decoder, so practically useless.