I just upgraded a RB1100AHx4 to 7.1.1 -- on reconnection after reboot I see a warning that I don't have a key: I thought it might be a weird 7.1.1 glitch -- the other two RB1100AHx4's I've upgraded were running 7.1 not 7.1.1 - so I tried a downgrade to 7.1 -- no luck, same message: MikroTik RouterOS...