Here is my experience w/ re220.
Bought a new one, got v3, not supported 
Bought a reconditioned one, got v2, yay 
seemed to work ok, but now that you mentioned it I think uplink only worked on 2.4GHz, not 5GHz
Bought another reconditioned one, got v1, boo not supported
Got a serial connection on v1, ran the initramfs version of v2 firmware, booted ok but 5GHz radio does not show up in Luci.
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