Manually install the latest driver from their official website: http://www.tp-link.com/en/article/?id=228 http://www.tp-link.com/en/support/download/?model=TL-WN851ND&version=V1#tbl_a

Compatible. http://www.tp-link.com/en/article/?id=406 Q: Are 500Mbps PLC adapters compatible with 200Mbps PLC adapters? Are TP-LINK PLC adapters compatible with adapters of other Brands？ A: 500Mbps...

Do not worry about that, not a bug. Log shows nothing...

You can try to upgrade the TD-W8970 to 130201 version...May it helps !

Argentina or UnitedKingdom ？ TL-WR1043ND V1 Or TL-WR841N V7 ？

Cannot to be done...