Ok, now flashed to latest 386.9_beta1 on RT-AC66U_B1 (via wired localhost and disabled VPN).
But, new warning after update: Your router is running low on free NVRAM
Maybe factory reset after final release(?). Is posible save config for fast settings after reset?
Ofcourse, i used AC68U.
Ofcourse, same issue.
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UI is not cached, after ssh login have old ssh, `openssh version` is stil on 1.1.1q... is some log about "fail" flash?