as it's been discussed before, when it was been updated to 1.1.6 I found that when I enabled MU-MIMO, it will be back to OFDMA only. Tried downgrade to 1.1.3 and this issue persist? and it looks to me it's been MONTHs but there's still no firmware to fix this issue? Do I really need to downgrade to the "BETA" version (something 1.1.1) which brings some other bugs other users reported after downgrading?