Mu-mimo TP-Link Archer C6 v3

Installing and Using OpenWrt
1

How can I enable mu-mimo on an arch c6 v3 router?

whan i
iw phy | grep MU-MIMO

it give back
[ MU_MIMO_AIR_SNIFFER ]: MU-MIMO sniffer

How can i enable it to not only sniff but rout too?
or it's just no way i can do it, since it's disabled on very low lvl?
HW support - MIMO 2x2:2 for each band

2

You need very dense/saturated network for any frame aggregation to kick in, like dozens in same channel.
Particular router has radio without DFS support, dont expect much from it, or in other words buy
new.
you can observe frame aggregations in ethtool -S phy0-ap0 and similar.