I have TP-Link TL-WN861N minipci card. It is 2.4Ghz only card, but in latest Router OS 4.0beta4 I can't get work 40MHz N rates (HT-40). HT20 work fine. Here is /interface wireless info print : interface-type=Atheros AR5416 chip-info="mac:0xd/0x2, phy:0x81, a5:0xf0, a2:0x0, eeprom:0x0" pci-...